Command Click didn\'t work for me, but heres what I did:
I edited planeshift_folder/data/options/mouse_def.xml to this:
The mapping is now different from the PC version, but it\'ll work for one button mice.
I tried to use some sort of system for the mapping.
Control = right click type of things
Option (Alt) = looking related
Shift = modifier if added to another or Mouse Run by itself
Heres a pic to make it easier to see:

Whats everyone think?
I actually use a Logitech MX700, but I\'ll try out this setup for a while.