Using mouse 1 to move forward causes selection dialogues to jump selections forward.
1. When the value box of a barter screen is selected, it will automatically start incrementing. (as if pushing the + button)
2. When selecting your character race in a new game, the race selection will "increase" to the top.
When choosing a keyboard button for moving forward, this behaviour stops.
Switching back to mouse 1 for moving forward, brings the behaviour back.
This is new since openMW 0.43. This did not cause issues in openMW 0.42.