Optional alternative navigation/selection mode

I admit i am a lazy person and my left hand is not on the keyboard all the time, i would find it handy to pan with the middle mouse button and use the left mouse button for marquee selections(when not clicking on a node). Any other convinient onehanded working way would do as well.

This is nothing important and super low priority but it would be nice for lazy guys like me...

I know i am giving a lot of feedback today, i hope you're not getting annoyed by it ;)