On the UI question, I recommend that you go ask RMM what’s available. (RMM owns mtnelectronics.com) AFAIK RMM normally just flashes STAR, so that would not be available, but I still recommend that you ask RMM. Tom E made something based on STAR that was closer to what you are asking for, but definitely not exactly what you are asking for. I’m actually kind of interested in the UI you described.
The FET driver is a DD driver, it will provide more current than the 32x 7135 driver. DD = Direct Drive, completely unregulated. It still has modes, but they all just based on duty cycle reduction from the highest mode.
If you’d like to better understand the different types of drivers, take a look here: lagman - Understanding the difference between Linear, Buck, Boost and Direct Drive drivers HKJ also wrote on the subject, but I can’t find the article right now.