There is three types of spawnpoints in CSDM: both teams, team A, team B. Feel free to place your own spawnpoints using built-in spawn point editor.
Concerning team balancing. I think it's not a CSDM routine. Try to make a plugin request or try to use AXN metamod plugin with it's strip entities feature to delete some existent spawn points on the map - they affect how many slots per team are possible.