[GenConfusion]

Yep u can change mid game using rcon if u like heres how:

rcon g_gametype x

where x = 1,2,3,4

1= Free For All
2= Team Death Match
3= Round Based
4= Objective

When you do this it wil say something like (and i cant remeber it exactly):

Gametype changed - will not take affect intil restart

so what you then need to do is change to a map type for that game:

rcon map obj/obj_team1 for eaxmple if you have just changed to objective.

You then need to configure the map rotation again as it will resprt to teh normal map rotation that was selected in the server config.