I think Ashley seriously needs to consider the needs of PC game developers. The 10% zoom limit is fine for tiny mobile game levels, it is a huge hindrance for even mildly ambitious PC games.
My PC game will run at 1080p. The player sprites are 200px tall and can move very quickly. The nature of my game is such that the layouts are going to be large, even when breaking up a level as much as possible between layouts. Like you delgado my layouts will be upto 200k (but not much more). At present, it is a huge pain in the rear to build levels, scroll around, move things or simply just eyeball layouts of this size.
My game is not yet optimised but still runs perfectly fine at 60 FPS on a modern spec PC and uses 1gb of RAM, so I completely reject the suggestion that we are creating games "too big" for Construct2.
There is absolutely no harm in extending the editor zoom capability. I really don't understand the resistance.
Others on this thread please comment if you agree.