Rated 3 out of 5 stars
What about pc-select mode? C- doesn't work though C-Shift- does, weird. And also C-_ (undo) doesn't work -- can't see any option in the configuration pop-up.
All in all, it's a bit difficult to interact with a mix of key bindings.
IMHO, the best of the two worlds would be to look at an init.el and honour basic options found there, plus scope-based enable/disable option, i.e. "textbox yes|no", "forms yes|no", "menus yes|no", "address-bar ..." etc.