It'd be awesome if you could make a mode that can save what you make, then the editor could reopen it to be played later (I know this is hard I've done it for my own FC). It'd step this up to the next level though.
I was thinking of revisiting the project and adding stupid simple stuff like that. It wouldn't be too hard as I could just pull the code from one of my other projects. Definitely something I've been considering already :)