As I see it Duane's suggestion really has two parts (Duane can correct me if I'm wrong):
#1) Stop putting race names on certification maps. Nothing changes in the database used for the website. The race name is still listed online for the course, so if you do a search of the race name the course will still show up.
#2) The above facilitates the idea of having two races use the same certified course. If another race is going to use the same course another record is included in the database that includes the new race name and the same cert #. If you do a search on the race name, the course will show up. If you do a search on the cert #, two records will show up, one for each race name.
#1 will be hugely unpopular with races, and probably many measurers as well.
For #2, how do we decide when to list a second race for a course? Does a race director just let us know his race is going to use cert #xxx and we then list his race as one that uses the course? Does he have to get permission from the owner? Will we have to keep a record of who paid for the course to be measured so that we know who the owner is?