i think the easiest way to change would be for the alliance researches to all be bought with gold. leave the resource percentage deductions the same but then convert all the resource taxes to gold via the 10-2-5-5 ratio and that adds to treasury. and leave the donations panel so that donations can still be made from all resources once donated they convert to gold in treasury also. in this senario u still get to spread out the tax evenly but u also eliminate the need for leaders to dictate what resources thier members need to produce in order for the alliance to gain its needed resources
this i very much agree with.