I'd like to request that Ruby API's web interface expose a listing of methods for a particular class.

I realise that to some extent this is an aesthetic decision and reasonable people may disagree. My argument would be that users may sometimes have an inkling of what they're looking for but nevertheless find it useful to quickly see the list of available methods. At the moment, the options are to search (which can be frustrating if you don't pick the correct wording) or to scan the documentation for a class (which can be time-consuming in big classes).

On mobile, it would most likely make sense to have this listing hidden behind some kind of menu.