The intellisense in source view is what I rely on, I just type <asp: and then intellisense makes it easy to find the controls and properties of interest.
But, fyi, I poked around a bit in design view and found where the ModuleTitle control was breaking design view in some places and was able to fix it. If you do svn update and rebuild it will have the latest fixes. If you do see any others let me know, I would prefer to not have errors in any design views, I just fail to notice them because I so seldom even look at design view.
Best,
Joe