My suggestion would be to add another form field called Value. Instead of entering gift certificate code you simply enter a value there. So for example you enter the user name in Customer field and desired value in Value field. When you click Add Gift Certificate to Balance button AwoCoupon will create a standard gift certificate with previously entered value and add it to the customer balance.
It could be done by adding new menu item
or by changing the existing one.
This functionality would safe a lot of time. Please consider. Thanks in advance. :)