I watched this excellent talk by Bret Victor, and thought that the segment from 10:40 till 16:45 shows an approach in direct feedback while creating games, that would be an awesome (and eye-catching) feature.
The one thing I miss in Contruct 2 is direct feedback: run your game, change variables, run your game again, test, stop, trial and error, ad infinitum. A very old-fashioned approach, and having a similar "preview and change while you preview" would raise Construct 2 to an entire new level not yet seen before in any other game creator (as far as I can remember).
Should not be too difficult to implement? nudge, nudge, wink, wink ?