That'll work, yes :)

It doesn't let you use neg numbers, but I can add a toggle to make the percent take away instead of add?

Any way to set a negative value here to reduce rival resources? All my rivals are only accepting metals because they have way too much of everything else. Would love to trade them concrete or food as well...

neat little add-on

Nice one imho. At some point you leave your rivals in the dust.

Your answer is in the description...

i gotta ask, why make this?