Did most of the work on this tonight. Coming very soon.
If I may add to this the ability to change the Cancel function to something other than the ESC key — I lost multiple recordings by inadvertently pressing ESC in other applications while Superwhisper was capturing
A double FN press for the global shortcut would be sweet, just like the macOS dictation shortcut.
An Van: I would love to see this as well. Something that is as easy to invoke as default dictation shortcut. One of the nice things about this is it's a very hands-off experience. So my hands are literally not on the keyboard. So having something that requires both hands is less than ideal.
I'd like to second this. Specifically, I'd like to use the "microphone" F5 button to trigger superwhisper, which currently trigger's macOS's dictation UI.

Shipped in v1.19.18