Say a station has a buy offer for Chelt Meat but only buys 109 of it. That's not much and if I buy more, I'll be stuck with some minimal amount of Chelt Meat in my transport ship.
Currently, I have to keep track of the exact number of that buy offer and click (or enter) that amount in some other trade window if I wish to satisfy the buy order.
I propose some sort of a copy/paste mechanism across trade windows to ease that process. It could work as follows:
Buy offer: Place a "copy" button somewhere. In this case, we want to copy the Chelt Meat buy offer amount.
Sell offer: Place a "paste" button somewhere. In this case, this would put the trading ship's buying amount to 109 Chelt Meat.
This could make the trade menu a bit less tedious. Thanks!