No, guys!! He's talkin about 2.0 cuz there is no yellow bar in the beta!! So, here are the real answers to ure questions!!
1. That is your powerlevel!! The higher the number, the stronger you are!!
2. No, it is currently not possible to transform in Alpha 2.0!! Although, you can download the SSJ Script 6.0 and look SSJ!! It also allows you to be many other characters that the alpha doesn't offer!! Get it at
http://ssjscript.cjb.net/
3. Alpha 2.0
4. Yes, you can explode beams prior to reaching their target by pressing secondary fire(default=right click), but you cannot explode uncontrolable attacks such as the Big Bang!!