Ability to set double press of a key as a hotkey and fn key usage

**Is your feature request related to a problem? Please describe.**
Its not possible right now to use double press of a key as a hotkey - e.g. ctrl+ctrl .
additionally usage of fn key is not recognized

**Describe the solution you'd like**
I would like to be able to use double of tripple press of a key as a dictation hotkey.

