Finally I found the problem.
The game got confused because I choose the same name for a python function and an ALIAS name in config.
Only one problem left: if you save and end the game while in walking mode (toggle walk/run) or with active autowalk you have to press the key twice for the first speed change or start autowalking when you start the game again.
At least I got another thing working: A sort of "view over the shoulder." In 3rd person view, if you press the "Lookback" key the camera switches so you can see what is behind you, pressing "Lookback" again returns the camera view to normal.
