Ugh - I realize I didn't explain the issue completely (or accurately) -forgot to mention the complicating issue!
we have mydomain.net registered with DH, while the original mydomain.com is still with the old registrar and won't be able to be transferred due to contractual issues for a few months at least. mydomain.com is set up as a mirror of mydomain.net
So we have the following domains
mydomain.net - fully hosted by DH
mydomain.com - registered w/another company, configured to mirror mydomain.net
forums.mydomain.com - fully hosted by DH
the forum files were originally at (and are technically still there) /home/adminuser/mydomain.net/forums, and were copied to /home/forumadmin/mydomain.net/forums.
forums.mydomain.com uses /home/forumadmin/mydomain.net/forums (both locations share the same database - we haven't updated some of our internal site links either - so users on the front end don't notice any difference right now)
So will there be any problems if I remap mydomain.net/forums to /home/forumadmin/mydomain.net/forums ?
(believe me, I wish things weren't so inelegant, but we had issues securing the .com address and had to go this route so we could get up and running until all the contracts involved expire )