2 supporters give the +15% at home... and 15 is the limit so I can't understand where is the problem... still the same max. with 2 or 1500.

Then about the conspiration of a "app" I doubt it knowing that the game is hosted in a external server so no way to do something direct... but is it possible to create an app to give an alarm to 500 persons to attend your matches? yes, thats basic programming.