Currently , if everybody quits in a custom game just leave. There isnt much point to play with broken favor atm.
Hopefully by the time they quit its because your team has been rocking them. If thats the case just storm their base and end the game for the favor points when favor starts to stack.
My thoughts on the Ai , I think its more of hinderance and should stay inactive at the back of the base.
The comp tends to suicide and be free gold for the opposing team thus making it harder for you.
Maybe that could have it run deffensive and only stay within the range of its own towers.