[PvK]

Maybe if you hack the map to have fewer VP's and make everyone use the hacked Version of the map?

Another idea would be, since Orania has some special defenders for it's victory locations, mod the un-summon-able monsters which guard some of those locations, so they are _really_ formidable...

PvK

P.S. The second idea would only work if the game is already using some mod, though, and would require everyone changing that mod to a new Version.