Hi !
I don't know if it has already been asked, but the ability to increase/decrease values like "Pos. & Size" by using up/down key like in Firebug would be great.
I know that it's already possible to do this in the editor screen, but I'm talking about the text fields "Pos. & Size" in the property tab.
So when you're in pos x field for example, you hit up key, the value increase by one and the widget position is immediately updated in the editor. And if you keep the up key pressed, the value is continually augmented.
It's a simple thing but really useful I think.
Keep up the good work, I really like WireframeSketcher and the very frequent updates :)