GUI хорош тем, что он не выбивается из общей концепции интерфейса.
In fact, it seems impossible. As far as I remember, the API allows you to replace or expand the built-in GUI, and if there is no built-in one, then you won’t be able to attach your own. Only by some workarounds.
Yeah true, a GUI would integrate better. There are ways to get it to work though, but that's why I said it's complex to make.
but it's a monster compared to this mod
In what way is it a monster? Because of performance? I would argue that it's impossible to the measure the difference between the two valve mods in UPS in a normal use case, or even Py megabse.
Or do you mean it's more complicated to use? Yeah, that it true, but it's what happens if you make things more configurable.