I posted a little tool to the LabVIEW Tools Network Developer Center that I find extremely useful for developing project providers.
When developing project providers, you must restart LabVIEW everytime you make a change to the provider VIs. This quick drop plugin in will quickly restart LabVIEW (using the Restart LabVIEW VI Server Method) with 4 easy key strokes: Ctrl-space, Ctrl-Q.
I hope others find it useful as well!
Currently I know of no way. I feel like this would be very difficult to achieve because the provider VIs are loaded at run time and resetting or reloading them might have ill effects.