Logitech Trackman Marble - Button Configuration

I'm curious how other users have the four buttons mapped, since it doesn't have a dedicated scroll wheel/ring. I may learn something.

This is my current button configuration (right handed setup).

• Large Left: Left-click
• Small Left: Scroll modifier (hold and move the ball to scroll up/down/left/right)
• Large Right: Middle-click
• Small Right: Right-click

The small right button is the most difficult for me to reach, so I assigned it to the function I use the least. I'm a Linux user and I use middle-click quite a bit more than right-click, I'm pretty sure a Windows user would be the opposite.