This was my exact comment, thanks.

It is a very good piece of work, and extensible with JS (I just tried that). I have a fear about the future because the dev is alone, and responds alone in the discussions. He is also quite, how to say, "rough" in the interactions, which I can completely understand, being the one pulled around by everyone.

This is a very, very good piece of work when you need to decorrelate the back from the front