We are happy to add dats for stuff like that.
In fact, if you have a special interest in them, why don't you become a renamer and a member of the team? I am not sure that we have anyone that can be considered a Unix or BeOS expert ATM and your special interest (and quite possibly experience!) can be an asset for everyone.
There's one renamer working on IBM PC floppies right now, so you may cooperate with him to add your floppies. There's no rule preventing you from adding alternative OS systems to our dats.
Glad to hear from you if you are interested in this.