I've been trying to add features helping with RVN overclocking to my pool, http://rvn.elitehash.net. It already supports per-worker stats but it's a bit tricky: you have to input the URL manually, http://rvn.elitehash.net/stats.php?addr=address.worker - the fix to support that in the search box and in the neater URL form http://rvn.elitehash.net/address.worker is on the works.