Generally our attitude is that if something is trivial with events we will not add it as a native feature. We are trying to make a developer tool which provides you with the building blocks to do what you want - not a cookie-cutter engine which makes identical games. Especially in the case of pausing, that's already one action (set timescale to 0), so I can't actually imagine how we could make that any easier!
We know many sites out there are Flash only, but we are a 2-man company and simply don't have the resources to rewrite our engine in Flash. Besides Flash has already been abandoned by Adobe on mobile so we're convinced it will by overtaken by HTML5 in future (if not already on mobile!). So I cannot see any good reason for us to do it at all since by the time we're done it could be totally obsolete. I'm sure in time Flash-only sites will move over to HTML5 - Kongregate already support HTML5 games, for example.