I'm having huge problems with this feature too. The old GD1 was so easy to use since you could easily modify and edit.
New GD2 is VERY difficult to remove unwanted characters, and bulk adding does not work as intended. When pasting a string, it lumps things together instead of separating each character as a character. PLEASE give us a simple text input like the old GD1. I literally can not work with GD2, it's very very frustrating.