eeeps, sorries cuc
sounds to me you guys haven't fully grasped D20 modern. I like this idea of doing special things by spending the Action Dice though. it limits the abuse that could happen, but still allows you player to try neat stuff.
For combat, i am in the middle of a complete rehaul of the d20 system's combat... system. We found it too limiting and almost like playing chess when you're trying to emulate how an anime character would move. For your called shots, i would say force them to spend an action dice per attempt, and give a penalty on the shot depending on the difficulty/damage it can deal. A kick to the chest is a lot easier than a kick to th head. To make it easier, the more precise (sp?) the attack, the higher the penalty to the attack roll, like a -1 for a punch to the head and a -4 for a punch to the teeth or eyes. If the attack works, either add more damage, make the attack a critical threat, or add penalties to the target (punch in the teeth would make it difficult to speak, might make them dizzy form the blow to the head, etc)
As for grenades and splash damage:
From the D20 Modern SRD
Grenades and Explosives
An explosive is a weapon that, when detonated, affects all creatures and objects within its burst radius by means of shrapnel, heat, or massive concussion. Its effect is broad enough that it can hurt characters just by going off close to them.
Some explosives, such as grenades, can be thrown, and they explode when they land. Others are planted, with fuses or timers, and go off after a preset amount of time elapses.
Thrown Explosives
An attack with a thrown explosive is a ranged attack made against a specific 5-foot square. (A character can target a square occupied by a creature.) Throwing the explosive is an attack action. If the square is within one range increment, you do not need to make an attack roll. Roll 1d4 and consult the table to see which corner of the square the explosive bounces to.
Roll on d4 Corner of targeted square
1 Upper Left
2 Upper Right
3 Lower Right
4 Lower Left
If the target square is more than one range increment away, make an attack roll. The square has an effective Defense of 10. Thrown weapons require no weapon proficiency, so a character doesnât take the -4 nonproficient penalty. If the attack succeeds, the grenade or explosive lands in the targeted square. Roll 1d4 and consult the table above to see which corner of the square the explosive bounces to.
If the character misses the target, the explosive lands at a corner of a square nearby in a random direction. Consult the tables below to determine where the explosive lands. If the weapon was thrown two to three range increments (11 to 30 feet), roll 1d8.
Roll on d8 Location Struck
1 upper left corner, one square beyond target
2 upper right corner, one square beyond target
3 upper right corner, one square right of target
4 lower right corner, one square right of target
5 lower right corner, one square short of target
6 lower left corner, one square short of target
7 lower left corner, one square left of target
8 upper left corner, one square left of target
For ranges of up to five range increments (31 to 50 feet), roll 1d12.
Roll on d12 Location Struck
1 upper left corner, two squares beyond target
2 upper right corner, two squares beyond target
3 upper right corner, one square beyond and right of target
4 upper right corner, two squares right of target
5 lower right corner, two squares right of target
6 lower right corner, one square short and right of target
7 lower right corner, two squares short of target
8 lower left corner, two squares short of target
9 lower left corner, one square short and left of target
10 lower left corner, two squares left of target
11 upper left corner, two squares left of target
12 upper left corner, one square beyond and left of target
After determining where the explosive landed, it deals its damage to all targets within the burst radius of the weapon. The targets may make Reflex saves (DC varies according to the explosive type) for half damage.
Planted Explosives
A planted explosive is set in place, with a timer or fuse determining when it goes off. No attack roll is necessary to plant an explosive; the explosive sits where it is placed until it is moved or goes off.
When a planted explosive detonates, it deals its damage to all targets within the burst radius of the weapon. The targets may make Reflex saves (DC varies according to the explosive type) for half damage.
Splash Weapons
A splash weapon is a ranged weapon that breaks apart on impact, splashing or scattering its contents over its target and nearby creatures or objects. Most splash weapons consist of liquids in breakable containers.
To attack with a splash weapon, make a ranged touch attack against the target. Thrown weapons require no weapon proficiency, so characters donât take the -4 nonproficient penalty. A hit deals direct hit damage to the target and splash damage to all other creatures within 5 feet of the target.
A character can instead target a specific 5-foot square, including a square occupied by a creature. Use the rules for thrown explosives. However, if a character targets a square, creatures within 5 feet are dealt the splash damage, and the direct hit damage is not dealt to any creature.
If the character misses the target (whether aiming at a creature or a square), check to see where the weapon lands, using the rules for thrown explosives. After determining where the object landed, it deals splash damage to all creatures within 5 feet.
^^^ as part of the SRD, Rights held by WOTC (tm) hope this answers your question. Also check out wizards to get the latest FAQ and Erreta for your book.
Catman: D20 modern is a pencils and paper RPG, where you need a group of people to play. Good thing is that D20 dnd and D20 modern are both free to downlaod off the net.
http://www.wizards.com/default.asp?x=d20/article/msrd
This is the D20 modern Srd, which means Standard Refernece Document. you can copy, paste, heck you could even publish this document without paying royalties, but you have to make a refernce or something to this actual document. It also is missing the Xp levels chart, which you have to actually buy the book to get.