Ctrl-' is hard (impossible ?) to get on french keyboards : it's on key "4", and Chrome intercepts Ctrl-4 as "toggle to 4th open tab" - so web-shell sounds way cool, but I haven't been able to even test it :-)
Plus it would be nice anyway to be able to pick a shortcut for web-shell that fits nicely into the existing set of keyboard shortcuts the app might already have.