Currency conversion in transactions

Since there's already a currency system built in the app, why not add a currency selector at the transaction "instead of the whole account being in a different currency".

For example, if my account's currency is in US dollars $, and while I was in Europe I paid in Euros €, I wouldn't have to make the calculation to $ in my head just to add the transaction. I can just select € and type the amount in€ and it will convert it to $ and insert it.

This would be a great feature for traveling, and will save us a ton of time.

Please note that this is not the multi currency feature, as it currently only works per account, as far as I know.

For the mean time, adding a simple calculator within the transaction will also help.

Thanks as always.