I would like to ask for the ability to download games.
I realise that this website and the entire community revolves around a lot of features and specifications which were laid out with online gaming in mind (the trophies spring to mind), so, naturally, downloaded versions would be somewhat "truncated" in this regard. Nevertheless, the ability to enjoy a story without being forced to a browser would be most welcome.
I realise too that it might be difficult in terms of format - it would mean an interpreter, probably designed from scratch. But... well, I know nothing about this sort of thing, really, but what if the formats were kept, using java... or html... or whatever... so that I could play the game in a browser, without having to have net access? It wouldn't be unlike having an HTML page and a couple of folders containing everything I need to read that page offline.
I guess this has not been a major concern, but this sort of online gaming is simply not my thing, whereas if I were able to download the games (and if you allow them to be played on a browser, even if when not connected to the net, you have guaranteed cross-compatibility), I would be most interested in playing them and collecting them (I'm a bit of a collector).