How hard is would it be to modify the total experience search field to search by %Number% rather than the exact term as it does now?
So someone can search for 15 and it will return those with 15 or great years exp.
Right now, though the query lines looks like this
if ($experience != '') $wherequery .= " AND job.experience LIKE %".$db->Quote($experience)."%";
it still only returns if the entire value is met.
15 Years is only returned if "15 years" is searched for, not if just "15" is searched for,