It would add a fair amount of overhead, but it would be a great benefit if ui users could coloring buttons, labels, etc. While it would require some rather difficult coding, the appearance of the ui elements would be much improved. I will eventually donate the video player even if the buttons and labels have to be black-on-white, but the lack of colorization is a deal-breaker for personal use.
My existing Python video player colorizes everything quite easily via tkinter. While LuaRT surely needn't include the equivalent of every Python library (and shouldn't, there are hundreds available via pip alone), the ui module should do a meaningful subset of what tkinter does, including coloring widgets. This is possible via the Windows API, though Win API coding is a major pain in the butt. I know, I had formerly done it professionally on occasion.
But kudos are in order for having a working ui_module at all. PUC Lua recommends IUP, which I find rather complex. Handling widget creation is quite easy in LuaRT's ui module, and running an event loop is quite simple--as easy as in Python, and far easier than in C++.
