Feature request: Entering values in the mobile app.

When tapping into an amount field in the mobile app, the numbers append to what is already there instead of replacing it. For example if I want to change $6.99 to $8.99 I have to tap into the field, delete what is already there, then enter the new value, otherwise I end up with $6998.99. It would be better if I can tap into the field and then just type the new value.