Thanks for the suggestions! For the first suggestion, you can try using the Pogo knob (with "Punch only" checked), which might help for you, although of course it's not ideal. I know some people have used it for that purpose though.
The second suggestion is interesting, but I'm afraid that adding things like that could make the plugin unnecessarily complex - eg. it might be better to layer different kicks/punches over each other, render them out, and then put that into Nimble Kick.
I'll definitely be keeping your suggestions in mind though!