The Avatar Performance Gating is fantastic, but I think it could be made better by allowing groups better controls for what they want to allow in their instances. Like if they're not bothered by polygons but more care about skinned meshes and Texture Memory, they should be able to specifically select those to gate.
I created quick mockups for UI ideas. Alternatively, instead of a big advanced option, it could be better, under the Good button that already exists, make a custom button that when clicked, opens up another UI or puts options beside it for every performance ranking with easy to understand drop downs for each one.