BLHeli and AM32 can be easily configured.
Recommended way
Works for: AM32, BLHeli
Follow the official howto.
Works for: BLHeli
The arduino needs to be set up with the 4-way interface. This is possible by flashing the Arduino with the 4way interface via the following screen:

I had problems flashing the arduino with my linux machine. Some thinkering may be required.
You need to check if the correct PIN on the arduino is used (TBD!).
Connect at the bottom at the window
Read Setup and make sure it workedESC setup -> Read Setup from ini file and load the config fileWrite Setup button at the bottom of the Window.Disconnect