I think a
Habbox Jobs forum (not a sub-forum) would be a great idea. Could even divide it into sub-forums, e.g Forum, Site & Habbo.
I think the best benefit of having a Habbox Jobs subforum though, would be that if Managers wanted to recruit one or two people instead of having a mass recruitment drive, they could simply post that they're looking for one or two people to join the team. Best part about this would be that people who regularly check the jobs & want a job in a certain department, would probably notice these sorts of things first, and they're the sort of people who are dedicated towards the job.
Though even then, having an Announcements thread every week announcing what Habbox departments are recruiting at the moment, would be a good idea. I'm looking at this in a professional Monster.com-esque (
link) kind of way. Maybe I'm overthinking it though.