Regarding user-generated levels, a level-editor is probably a bitchload of work considering how much it's likely to be used. After all, Abe HD will have fully 3D backdrops. How are you gonna make those in a level editor?
As long as the structure of the programme allows it to be modifiable, mods will appear if modders are interested. If the demand proves to be high once the game is out, then you can design a level editor built to cater to the emergent demand.
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