Max Food Limit

Is there any way to change the max food limit using a chain of triggers or something?

Set all food costs to 0 and make your own food system with a leaderboard.

I don't know if this is still true in retail but -- in beta if you set a unit's food cost to 0 and killed the unit the game crashed. Removing the unit didn't but killing it in anyway (by trigger or by another unit) did crash.

Try using the action: player - set property.
Choose food max from the list.

Just like Berry2k said just make your own Food Limit Indicator, set all unit supply to 0. Then make a variable for each unit, whenever a unit completes training, make a +x to the variable, and record it on the leader board. If you're heading this way, just tell me I'll explain all of this.

Anyone tested to see if killing a no-supply unit still crashes game?

does it crash? well my BattleField Command Map in wc3beta doesnt crash the game, even though all of the units in the map has 0 supply, and they get to kill each other.

No, it doesn't crashed!