Itll be VERY hard but will come out with good results:
Make your OWN TRIGGERS!
Ok, make it so that whoever commands the least units/buildings by __ ammount of time is attacked UNLESS all players have over ___ units.
If that is the case, then build a larger army, then do the trigger.
If a player has no detectors, attack with DTs
If players start massing on lets say Carriers, then start building Hydralisks or Corsairs (good anti-carrier stuff)
If players start expanding, make it attack the weakest expansion
If players has less than __ number of units at their main base, then attack the main base.
just several examples
