You won’t lose any stats so long as you use the same user name (and don’t forget team 36120). You will probably lose the completed portion of the current job with a reinstall.
If you use a different user name the points will accumulate to that user name and aren’t transferable. But, you can change back at any time.
Well I should have the jobs I'm curently working on done by tomorrow, if I don't hear of an answer to why you can't add switches to a GUI setup I'll try the reinstall one one of my machines and see if it does any good.