No sorry you have me wrong, personally I want this for solo/co-op play but it could also be used for non-competitive vs. games too.
It's not really for a balanced competitive nature so even amounts for both teams is not an issue. What it would does do is inserts a lot more tank encounters into the game and guarantees that you get at lest 1 per map or more depending on the time limits you set.
It wouldn't set specific places for the tank spawn, it would use the z_spawn feature to simply spawn them nearby but out of direct sight. This way it does not take up the usual boss spawn zone and the witch would then able to spawn at all of them instead using force witch.
Again this is not for a full competitive match, it is simply to increase the possible amount of tank and witch encounters while still keeping the surprise element of an incoming tank. Bringing a lot more boss action to solo/co-op.
I enjoy playing with force witch on and getting 4 or 5 witches in some maps, but unfortunatley it also takes away the tank spawns too and there is no options to guarantee a minimum of one tank per map in co-op let alone 2 or 3 without z_spawning on the spot (Which is not random at all).