I've felt relatively safe using my Craftsman lift and always raise it enough to set the lock bar. BUT, I will definitely be more mindful of a tip over possibility. I already had one bad experience on my Condor chock (I now use ONLY for trailering with it screwed down). I uncovered the bike and with my back turned, I heard it fall. By shear luck, I had a soft tool bag and and cardboard box on the side it fell which protected the tank and kept the bars off the ground. Both wheels were in the air. Only visible damage was a broken left peg and it slightly bent in the left exhaust bracket, which was easily fixed.
Since the fall, I NEVER walk away from the bike except on it's kick stand. As far as your dents, I would call some of the car dent removal companies in your yellow pages. They will come by and tell you if they can remove it or not. They've done some amazing things fixing my car dents.
