Since Sellathon counter is not always accurate, it would be helpful to be able to at least select eBay's hidden counter. Presently, I now have to go back and edit each auction once it posts to eBay, just to add the counter.

This is what I do too! So all my listings are always "revised". Have yu found a better method?

Vendio.com has free counters...you can set your preferences there to automatically insert counters on all future auctions.