Only way to change those entities would be to decompile it into a .MAP (do not open it in hammer). Find each starting point in CS for the teams. Change them to INFO_GOOD_START and INFO_EVIL_START. You do that by opening the .MAP in notepad. Other players won't need to download the map. They can just put (say Dust is the map) DE_Dust.bsp into their ESF>Maps folder, and then they can join a server running the modified version, and it will work. You can find a tutorial for it on Counter-Map, I think. In my opinion, it isn't worth it, trust me. Everything will be really big and you will float off the floor by a foot or so. Not to mention, there is no room to fight at all. No one will play it.