As some of you know I host Multi-User Dungeons (think text based RPG). Most of the folks I host have a couple of people that are "Coders/Builders" that may require access to the shell account for the hosted person.

If I host a persons mud named jack
how would I allow a person named Tim to access only that persons home dir yet maintain a seperate user name for tracking purposes?

Hopefully that was clear enough but if not this is what I want.

Host a single mud username jack with home dir
allow Tim and John access to Jacks account without giving the password of Jack's account to them, and not have them have a home dir?