Cross-posting a plugin request here due to CSS relevance, looking for feedback

I posted the following in the Plugin Ideas section but wanted to get feedback from the folks who hang out here in particular. I’m not a developer, I just know enough to be dangerous with code. Maybe what I’m looking for is what github is all about, with versioning. Or maybe the idea is impossible to deliver/sustain. Any tips for people with a theme tweaking addiction? Or do I need to check into a clinic where the clientele is limited to just one crazy person who needs to get over it and get back to work?