User authority controls

We have a good handle on authority setup for new employees and on
removing authority for  employees who are leaving. What we struggle with
are those employees who change jobs within the college. Sometimes those
are people leaving one department and going to another, sometimes those
are people just getting a title change. Our HR office is very good at
telling us who new hires are and who is leaving but not so good at jobs
changers. I am curious to know how you handle these people from an
authority control perspective. One idea we had was to look for any title
changes and treat them as if they left the college and are coming back
in as a new employee. Disable their account and revoke all authority
then grant just the base level of authority to the new job until we hear
from that persons new supervisor. Of course this then requires going
into all the systems where mcunning has an account and disabling it.
Another thought was to stop creating accounts based on someone's name
but use their position instead. So my userid would not be MCUNNING but
ITSDIR. ITSDIR is granted authority not MCUNNING. When MCUNNING changes
jobs the ITSDIR account would be disabled and my new job account would
be enabled. When the new ITSDIR comes on board we reactivate that
account. We use to use this method a long time ago but our users
revolted because it is sometimes very hard to turn a title into 10
characters and have it make sense. Try coming up with 10 characters for
Director or Desktop  Computing/Academic Computing/Media Services.