It seems that with your mod, I'm unable to assign the morph keybinds. Normally, in the keybinds menu, when you click on the morph menu keybind, it brings you to morph's own keybind menu, where you can reassign keys there. Instead, with your mod installed, it wants a key instead, and doesn't actually bring you to morph's keybind gui.

Forge 965
Morph 0.6.0 (apparently this was working in 0.4.0, but is no longer functional.)
NEK 0.4.0
Multiple users have submitted me this report, so I tested it myself and you can see that MC is asking for a keybind when I click on it, hence the "???".
I posted this on your forum thread yesterday, but didn't see there was a github here, so I'll post here in the proper place.
It seems that with your mod, I'm unable to assign the morph keybinds. Normally, in the keybinds menu, when you click on the morph menu keybind, it brings you to morph's own keybind menu, where you can reassign keys there. Instead, with your mod installed, it wants a key instead, and doesn't actually bring you to morph's keybind gui.

Forge 965
Morph 0.6.0 (apparently this was working in 0.4.0, but is no longer functional.)
NEK 0.4.0
Multiple users have submitted me this report, so I tested it myself and you can see that MC is asking for a keybind when I click on it, hence the "???".
I posted this on your forum thread yesterday, but didn't see there was a github here, so I'll post here in the proper place.