Whever I trade I first set up the base deal how I want it until it is something the AI accepts on. Then to ensure I don't waste any value I get them to give cash to the exact amount before they wont accept the deal. However currently it is very annoying if the AI has a lot of cash because the drag increments will be large which forces me to tweak the cash value one by one which is quite slow. Rather than mess with the speed I think it would be an excellent idea just to have some option to click which selects the exact amount of cash to make the deal even. There could also be a similiar option for influence if you wish to use that instead to even the deal.