[mercurial]

> The JMAP format massively reduces round trip times, especially when you have sequential operations where you must wait for one to finish before the next can happen.

I hear you (REST and batch operations don't mix too well). But wouldn't it be possible to simply provide higher level operations, grouping several of these commands?

> And once you're not doing REST, I don't personally think putting HTTP verbs in the method calls doesn't really make it any clearer, and is just likely to confuse matters.

As I said, it wouldn't necessarily be restricted to HTTP verbs (eg, using 'create' and 'update' instead of 'POST' and 'PUT'), but I do like the idea of separating the resource you act on from the action on this resource.