I am currently travelling and forced to using portable RStudio via my smartphone . I noticed that RStudio.cloud doesn't have below functions compare to RStudio server.
In theory a windows tablet should work, although I don't think we have one to try it out on.
That being said, we have gotten a few requests to make it possible to use the IDE from an iPad for example, and my understanding is that with some of the upcoming work on the IDE, that should be supportable.