FOSS gamedev and creative worlds

Is it possible to grant creative mode only for some group of users, not for everybody ?

Not with the default creative mod, but you could code it yourself or ask someone nicely

That is so funny that you would bring that up. I was just planning something that puts anyone with the give privilege into creative mode. It's basically just a slightly altered copy of the creative_mode plugin, but it should do what you want. I'd love to be able to make it work without basically having a second set of all the same code though. I'll post what I end up with when I have time to work on it.