I was initially confused, because some of the features I was trying to use with custom morphs weren't working. More specifically, most actions, particularly the ones that fire projectiles, would not work if I reloaded new morph settings with them. Although I didn't test it fully, it seems the hostility setting seems to be broken by this too; it was seemingly ignored when I was reloading, and would always assume true, even if it wasn't defined or explicitly set to false.

Everything else seems to reload just fine, and the actions will work properly if you close and reopen a world (aka restarting the server). I have yet to test hostility being broken in that case.

Indeed, IIRC, when you use this command, it doesn't update present morphs which were created at this point. It's kind of difficult to implement, but I'll try fixing it. Thanks for report!

Should be fixed in 1.1.7.