For a game made and exported in Construct this would make sense if you don't know how to make such a editor for your game using Construct event system, and here we are talking new entry Construct users.
So for that reason i'd say some new Construct users might want this type of thing, but for an moderate/advance user of Construct this makes no sense, since we can code a level editor in the game using Construct(and some custom plugins/behaviors as dop mentioned) and have way more freedom to the objects than the features you listed.
To me it seems you have a pretty good sketch of what you want the template/features to be, and is a matter of doing it and put it out there, and see how people receives it.
From what i can foresee is that it will have some use for some people.
Hope it makes sense what my input was and helps you pin down the issues (pros/cons).