Mark Wahlster , Mar 10, 2009; 02:18 p.m.
Using the lever to wind instead of a mounted MA motordrive (which is what you taking about not a winder as no winder has a vertial shutter release) Will have no effect on the camera. All it does is turn the gears in the motordrive it will be a little harder to wind but unless you really reef on the winder I can see no problems.
And no I have never used it just as a grip. I have a Pair of T-90's for that LOL.