I think counting your FTF's is important to any geocacher [and would promote users to buy premium accounts in order to get more FTF's].
First, when you log a cache, there would be a check-box right next to the "add favorite point," "encrypt this log," and "Add a coordinate to this log" checkboxes on the log page. You would click this box if you are FTF, and it would send a notification to the cache owner to choose FTF's for the cache. The cache owner would then go to the cache's page and see little check boxes next to everyone's logs so the CO can read through the logs and see who the first person [our group of people] found the cache, and check them off. Now the FTF's are accounted for.
I don't think this would be too difficult to implement, but it would make cachers happy, and promote premium accounts