Would it be possible to create a gamerule/command which allows certain players to morph/open the morphmenu? This would be really good with the origin mod as a "shapeshifter origin"
Or going further there could be a specified list of what mobs can a player morph into. For example: /something playername allow/deny onemob/allmobs
By allowing certain players to morph into certain mobs. it would be possible to add new abilities to the origins (the blazeborn could only morph into blaze, magmacube, the fantom could have the undead creatures and etc...

This feature could bring more variety to the use of the morph mod.