A simple improvement: when pasting a value into the Amount field in Expenses, often what is copied contains a currency symbol ($). Since that's not valid, an extra step of erasing the currency symbol. In a recent update, it actually seems that the entire field is reset to 0.00 if you click to another field.

It would be very helpful (and likely quite easy) to implement a bit of Javascript to strip out all currency symbols, commas, etc, or strip out everything but numbers and a single decimal.

This could actually be implemented in multiple areas (Invoices, etc), but Expenses is just where the issue presents a problem most often for me.