We used to have the command but it did not automate the joining and leaving of crew members.

I mean just imagine the programming, every time a crew member joins or leaves, one thread has to scan all claims in order to adjust perms. Or the actual claim plugin has to interlink with the crew plugin to see upon player action, if he/she is actually trusted via a connected crew.
And just for the fun …. then the owner leaves the crew but doesn’t update the perms. Who or what is supposed to be triggered to adjust all perms again ? Does the claim perms stay with the original crew or transfer over to another?

I am not saying it can’t be done, but it’s not gonna be easy 🙂