It would be neat if we could export these projects as a screensaver.
I’m assuming there’s probably some screensaver available for both OS X and Windows that displays web pages, but it would be neat if PlayCanvas could export a native OS X and Windows screensaver with a touch of a button.
Could be a “member only” feature or whatever 
If you can specify executables as screensaver, then it is trivial 15 mins thing to wrap downloaded zip build with some native wrapper such as electron.io or node-webkit.
Other interesting project, partly related but for interactive wallpapers: http://steamcommunity.com/sharedfiles/filedetails/?id=572005235
Otherwise I personally don’t think that this is any demanded or useful feature to have considering a need of implementing and maintaining it. It is trivial for user to wrap in whatever wrapper they want and distribute as screensaver.