Is it possible in Construct 2, or would it be asking for too much as a feature request?
Right now when we load a Construct 2 game, we load the entire HTML5 page before we start playing. If we make a game with large world and a lot of image files, that's going to take a long time to load. If images can be loaded on demand (eg. where the camera is showing, plus a margin beyond), it would be possible to have a large world without either split the game up, takes too long to load, or having to shrink the game.