Hi there - I'm often stuck using a single button mouse on a mac laptop. I can still right click on stuff using a certain key combination but I'm still having trouble doing more complex selects. I'm finding it a wee bit difficult to select two nodes and link them - I can do it but it's painful :).
It is also difficult (or maybe impossible?) to select numerous items from within one branch without selecting a range - you know what I mean? Like when you use CTRL+select to choose multiple entries from a select list in a form. I'd love to see this made easier.
Otherwise, I'm not really complaining... keep up the good work! Runs perfectly well on macbook.