I found a bug related to that, a sort of lock as I suggested

When I am holding the key to walk and hit enter to get into the chat-window, the char keeps walking. As long as this auto-walk is working, I can navigate through changing the camera-position while beeing in the third person-view. The char does some weird movementes (like hopping) when typing, but it works just as I proposed here.
I also experienced auto-running with that without loosing stamina. Perhaps those bugs could be used to implement the functionality as I proposed? Would be cool to use this \"bug\" on purpose without the little side-effects as hopping, jumping over a cliff while in auto-movement, not loosing stamina...