No support, well atleast for KitPvP and OP PvP. I think that KitPvP and OP PvP need to stay the same as they are KitPvP and OP PvP.. If this was added, you might aswell just rename the servers 'Tean PvP' and 'OP Team PvP'. As for skywars, this could be used to join games together but not as a 'team' to say(like, you can still hurt each other, yah know?)
In my opinion, this isn't a great idea. It ruins the hatred for betraying each other. Then you party like 100 donors the shrek everyone. Just my opinion:P
Support but not for Skywars as how would you win if you can't hit each other and you were the last two alive?