Lock function key

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First of all: Thank you very much for this great working piece of Software.

Is there a way to lock the function keys (orange and green) for the next 
pressed button? (as it is using the chatpad with xbox 360)

And also is there a way to hold down a button? (e.g. multiple times backspace) 
```

Original issue reported on code.google.com by `Jakob.St...@googlemail.com` on 3 Feb 2015 at 4:24
