Allow capital letters as hotkeys

**Is your feature request related to a problem? Please describe.**
I have multiple types of labels and various classes for the same project. As such, I have run out of hotkeys available on the keyboard. For example, shift-R, ctrl-R, or alt-R would allow more hotkeys.

**Describe the solution you'd like**
Ability to use shift, ctrl or alt to increase the number of possible hotkeys.

**Describe alternatives you've considered**
- I am not using a hotkey for some classes; I can still use the mouse, but it is slightly slower.
- Different projects will be used for the other label types.

**Additional context**
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