I want to scan only when I choose to scan, not everytime pvd opens.
 Actually I feel stupid, I did not realize that I could save the folders, but not tick the box that says "scan everytime pvd starts".
 
 Still, the only way to scan when I want, is to tick the box, close pvd, open pvd (do the scan and everyting) then untick the box before closing pvd again.
 A "scan favorites folders now" button would solve this workaround.
 EDIT: By playing with it I just realize that it DOES it!
         I must have waisted so much time going through the ticking process...