PHDs on multiple computers, NHDs on others

I'd like to set up a system in which each user has one (or perhaps more than one, if possible) computer on which they use a portable home directory, but I'd like to allow them to log in from other people's main machines using their network directory. Alternatively, I would be OK with a system that allows them to create portable home directories (is that the right term? Should I call it a mobile account?) on other people's computers, but I'd like such accounts (ones not on computers tied to that username) to either expire after n days or be preferentially deleted if disk space fills up or something.
Looking at the User Management documentation, it seems like the default behavior is to require users to have administrative access to a computer in order to create a portable home directory on that computer. This would seem to mean that each user could have one on their own computer, but could only log in with their network home directory from other computers. I assume that in the lab situations they describe, in which one might be concerned about a proliferation of home directories, every user is given administrative access temporarily, or something like that.
So I guess that this situation would be fine with me, but is there a way to instead allow any user with certain privileges in the LDAP domain (i.e. any staff member) to create a mobile account on any computer, but to have it expire if unused for n days or something like that?
Thanks for your insight into this,
Greg

I think that was what I was looking for, although I wasn't sure quite how to frame the question. This would be good enough to allow me to have users' mobile accounts on their own computers not normally expire (although if they go away for a vacation I guess it would, so it would still be nice to be able to allow exceptions to the expiration policy based on computer/user pairings), and then users could create mobile accounts on other computers if they want to. Of course, I might just end up having users only have mobile accounts on their own computers, because most of the time people probably won't need them on others' computers, and it might confuse users. In that case, I could just require users to have local admin accounts to create mobile accounts, and not worry about expiry policies.
Thanks,
Greg

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    My name is Chris, and please accept my apologies for the delay in our reply. This is not the customary wait time for a reply from iTunes Store Customer Support, and your understanding is very much appreciated. If you require any further assistance after this message, just reply to this email; your response will come straight to my inbox and will be given top priority!
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    INITIAL EMAIL SENT: by me to apple representative
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