I am still confused at how you got the bike rolling without the clutch.....
I broke my clutch lever a while back and had to nurse the bike back to camp. In order to get going I had my buddies give me a push, then I could shift into gear and go. Are you saying the from a normal situation, dead stop, engine idling, you drop it into first gear and can just take off?
Or are you reving the engine way up, drop it into first and let the rear wheel spin?
While on a stand, with the rear wheel off the ground, I am not surprised that the wheel will turn when the bike is in gear and the clutch pulled in. It is normal for there to be a significant amount of fluid drag in the clutch, enough so that it can be hard to start in gear and a bitch to push the bike with the engine dead and in gear.
Like mideastrider said, try getting the bike going, shift into a higher gear (3rd or up), pull the clutch in, give it some gas and stomp the rear brake. If you stall the engine then you definately need to pull it apart. If the clutch breaks loose, let it rev for a few seconds, then start rolling again to cool things off (if there was friction involved things can overheat rapdily) then do it again.
Rod