I think this could be a quick(-ish) fix / feature. When I enter a purchase in a foreign currency, the exchange rate is what QF allows me to change to alter the sterling currency amount:
Is it possible to make both exchange rate and GBP amount entry boxes and calculate one from the other?
Typically I’ll know the GBP amount rather than the actual exchange rate for a foreign currency (e.g. from the entry in my bank account). Making one calculate from a text entry in the other would keep the current functionality, while making it possible to work the other way round as well. The system could of course continue to auto-fill with the day’s exchange rate and calculated GBP equivalent.
At present I have to find a calculator, or go through a process of trial and error entering different FX rates to get the desired GBP value.