[quote="stainsor":1ninpcdq]Ah, I didn't realize custom platform movement wasn't possible in Construct. Too bad. Maybe in a future version?[/quote:1ninpcdq]
What Aeal means is there is no way for the player to customize the key controls at runtime yet.
You can make any custom movement type you want with events, including your own platforming behavior. But the default platform behavior works really well, and it's easy to add custom mods to it. So unless you have a really good reason not to use it I don't see why you should bother trying to make a completely new custom movement. For the most part you don't have to go reinventing the wheel just to make your game.