Thank you for your kind words and for all the suggestions! Please see my answers below.
It would be helpful to be able to detect broken links when renaming screens during a refactoring.
Dan, I added refactoring some time ago. I am not sure what's happening in your case. Please see this blog post with more details. If refactoring doesn't work for you as described there then try sending me a bug report using Window > Preferences > WireframeSketcher > Report a Bug:
Screens should have links just like buttons and rectangles.
Dan, I think you are looking for storyboards. Storyboards allow you to create PowerPoint-like presentations. This is where you can arrange screens in the desired order to show the progress from one screen to another. A storyboard is created using File > New > Storyboard.
The tiny scroll "tabs" (not sure what the proper name is) that scroll the Palette window are a pain in the butt, especially at 1920x1200.
I am aware of the problem with palette scrollbars. Thanks for reminding me. I'll increase the priority of this issue.
Conversely the icons for the widgets are huge at that resolution, far bigger than they need to be.
Dan, you can righ-click in the palette and change some of its settings. You can choose small icons and change the layout.
It would be very helpful to be able to re-order the widgets in the Palette window.
This was suggested to me before. I also think automatic reordering based on usage frequency would be a nice touch. I am still thinking what's the best way to implement this. Meantime try using the Quick Add via Ctrl+Space.