I should clarify - I don't mean truly zapping all over the place, but for instance, running down the coast, rather than tracking perfect straight lines from pt A to pt B. I can apply a little common sense!
That said, I have seen a RIS used during aerobatics where we informed that we would be conducting aerobatics 'in the vicinity of X between 3000 and 5000ft'. Which seemed like a damn good idea to me! But that was in the UK.
Also, yes, off in G (and even E), I don't have to request levels generally. But again common sense would suggest to me IF you're getting radar services, there would be some form of interaction with ATS.
For those that have used it, I would appreciate an example or two of how it works / the comms involved in practise.
Cheers.