This is strictly for people still using plain mice!
I recently upgraded my rodent collection to a SpaceMouse and a trackball. I am right handed and have the SpaceMouse on the left of the keyboard and the trackball on the right.
The SpaceMouse has two programmable buttons and the nice thing is that they can be programmed to do pretty much anything that you would normally do from menus or shortcuts in SU.
The trackball has a number of programmable features but they are not so specific to SU. They can be programmed to do different things in different programs but they are still just basic computer commands. However, I have two buttons next to the trackball itself which I have programmed to mimic double click and triple click. Oh my, how that improves things and removes the lottery of how many times you have clicked! A revelation.
Thought I’d share this as these two bits of kit have improved user experience no end.