Can you offer the option in the config to switch off the client command (/zoomify)?

Why?

Because at first I think it's useless having a command that takes you to the config menu, can't you do that with modmenu too? And secondly, because the mod adds more commands such as /fcc and /fabric-command-api-v2:client. And then it gets pretty confusing when there are so many weird useless commands.

Zoomify doesn't add such other commands, this would be Fabric API doing this. Having /zoomify is an option for whoever doesn't want to use Mod Menu for whatever reason. It is also helpful in dev env when mod menu isn't available.