It would be great if GE would have the following feature: Adding external resources (png files, midi files etc.), while the game is running.
Maybe there's a "custom" file with the game, where some data is stored but GE can't load the stuff, because if a file format of the creator of that game and not known. The programmer could write a script that reads that file and creates the real files, such as a PNG file, to load it into the game. The "custom" file could have stored information like "fill image with green, draw line xy etc.", which wouldn't need much memory. I know I could also use canvases, but what's about the sound?
I think more resource handling functions should be added into GE.