Describe your idea, include images if necessary

I want to include this in a mod pack, however I don't want people getting access to morphing right away, I am aware I can use comands to control what people turn into and I can use this to resolve the situation, however is there any way to temperarily Disable for everyone untill I give them the ability

Take a look at the wiki page for the config file. You can configure the player blacklist in a way so players can't unlock but morph.

(I think you want to set blacklistPreventsMorphing to false and playerBlacklistIsWhitelist to true).