DefaultGameType for invasion maps?

does anyone happen to know what the preferred DefaultGameType for invasion maps is? I've been using xGame.xDeathmatch, but now that i'm trying to test stuff specific to invasion, that's not much help cuz the Play Now button just fires up the DM gametype. Thus i'm relegated to quitting UED (it's just a good idea) and starting the full game for 30 secs of play. Setting the proper DefaultGameType would save a lot of time.

neither unrealwiki nor udn say for sure. . .

Any ideas?

Not sure. Perhaps SkaarjPack.Invasion
However, I am not sure there are any maps specific to invasion - the maps are generally Deathmatch maps.