In version 1.8.6 the OpenFFBoard now has support for more button and analog sources:

• Local pins
• CAN frames for buttons and analog sources
• PCF8574t I²C port expander for buttons
• Analog Shifter (Logitech G29/G27)
• SPI shift registers and Thrustmaster wheels

External encoders for TMC allow the use of BISS-C and Magntek MT6825 encoders with the TMC4671 motor driver module even when those are not directly supported by it.
This works by reading the encoder at fast intervals and forwarding the position via SPI to the TMC4671. This increases the load of the microcontroller dramatically but seems to work well in usual setups so it is a viable solution if you don't have a directly supported encoder.

From this version on the configurator also supports the windows dark mode and the TMC graph follows GTK styles as well.