In this moment, Left click and Middle click mouse buttons has same function.
Idea is to map Pan tool to middle mouse button which will allow us to move block diagram (and front panel) when button is down.
Some block diagrams doesn't fit to one monitor (Main FPGA VIs and Top level VIs) and more pleasant scrolling/panning will be great.
This feature could be accessible by changing value in Labview.ini file.
