Regarding editing
Personally, I'm not interested in editing - I’m interested in procedural generation. If the output of my generator requires too much manual editing, I'd rather not publish it than spend time on tools for making those adjustments. However, if there's an easy way to implement some editing capabilities in a generator, I do it. I don't see how this could be done here, but maybe I'll figure something out later.
Regarding generation
There are several reasons why these layouts often make only a “limited amount of sense”. One of the main ones is that I’m not making an app for planning real houses, it’s not CAD. This generator is designed to create maps of "house-like dungeons”. Some features unconventional for regular houses are added specifically to make these plans suitable for in-game exploration, loops for example. So too many non-rectangular rooms are not a problem imo. Access to the living room only through the kitchen is a problem, but not a huge one. The lack of support for circular plans IS a problem. Ideally, there should be a slider for setting the desired level of “normality” and maybe there will be one someday.