UI- in my option doesnt need to be pretty just work 
I do love the update!
what about, for the different stepper sockets, having a drop down for either the TMC2208 or TMC2209 steppers (current two options for them on their website). For the first 4 steppers keep them as the standard like the SKR mini e3 (x,y,z and extruder). The 5th stepper have for a default second extruder? Most everything else would then stay the same.
Just a thought.