CF UI feature request

To whom it may concern,
have checked RT wiki, and google which has information I could use
to probably
code this feature (using overlays and/or ?)
Here is the idea: I added a custom field called 'Assigned to’for
tickets; in addition
to Owner and Requestor, the ticket can be ‘Assigned to’ someone (a
User). I typed
in the select-from values for this custom field but would have liked
to have
a dropdown (as there is for Owner for instance) so that 1) RT 'knows’
are valid Users and they correlate to core data and 2) I don’t have
to type
them again.
Do you think this is a reasonable addition, not just for our site but
RT in
Thank you.

L. Evensen
ps, sorry for the previous email with wrong name!