Wow, nice, I think it might be exactly what’s happening. Just did a test, changed the code to “Dopesheet Generic”, then manually added the keymap. Disabling my add-on stops the function and changes the associated action, but re-enabling it re-registers the keymap properly. Gonna try your nifty piece of code and let you know if it does the job!
…Oh and yes, my operator always shows up in search.