Well you couldn't call it Team Slayer anymore, because it'd have Objective in it.
I think your best bet for objectives on Community Maps is just either a Community Objective list or certain gametypes on those maps in Action Sack (Hot Potato, Speedflag, Speedpile, etc). Or if they're big enough, show up as objective maps in BTB. They aren't going to put any of the existing community maps in Team Objective because it has the highest ratio of players on 4 player splitscreen to total population, and community map makers refuse to stay at or under the object count and performance bar of Asylum
I think your best bet for objectives on Community Maps is just either a Community Objective list or certain gametypes on those maps in Action Sack (Hot Potato, Speedflag, Speedpile, etc). Or if they're big enough, show up as objective maps in BTB. They aren't going to put any of the existing community maps in Team Objective because it has the highest ratio of players on 4 player splitscreen to total population, and community map makers refuse to stay at or under the object count and performance bar of Asylum