Exposed, but not manipulated and edited visually with the click of a mouse pointer or stylus in order to stretch, grow, shorten or etc, etc -
until @WaffleMutt states otherwise,
Excuse me? I've just about had it with you making up facts and acting as if you know more about the engine than I do. When I say something can or can't be done, that's the way it is, full stop. Not because I'm the admin, but simply because I know how the thing works. I've literally contributed more to the OpenBOR codebase than every single other developer
combined. GitHUB's words, not mine, and that's before the 4.0 code.
OpenBOR does not (and will not) directly support mouse inputs. So what? Capture directional inputs instead, use any one of the six action buttons as left & right clicks, and off you go. No different than the pointing stick on a Thinkpad, and perfectly compatible with a mouse to digital input app. If you want to get really fancy, you could even write up acceleration algorithms to make the directional input behave like it's analog.
As for the actual editing process, that's all been done before. Here's one I whipped up last month just for myself. It allows me to position layers or objects and adjust their scrolling properties in real time. Nothing too fancy and doesn't handle collision, but it could if I thought that was worth adding.
Here's another for piecing together grappling moves from over ten years ago. Yeah, that's right. Not only can you edit levels, you can also build new moves to characters in real time.
The catch to all this? You actually have to study and experiment to get yourself on an advanced level. Then you have to put in the work to make it happen. Taking guesses and making assumptions won't cut it.
I'm giving you a friendly warning. Stop telling people things can't be done just because you haven't figured them out yet.
DC