Very interesting. I see I need to update bits of my plugins to properly shrink, like the image preview in Octolapse as well as some text overflow/ellipsis in ArcWelder.
Overall I really like it! Nice job. Since you asked for feedback:
One thing I would love to see is that the webcam popup be centered vertically in the browser window, not centered on the page height. Vertical centering is yucky to do though....
Another is the collapsed menu in the upper right. Personally (this is just me), I'd rather see it drop down and not extend the header:
The 'span' class width in the new settings is a bit odd, but I see why when looking at the div with the 'tab-content span9' class applied. Would be nicer as a span 12, but not sure how to achieve that. Also, due to a bunch of padding being added to the modal body and some other elements, a span12 would yield a scroll-bar, which is not ideal either. Anyway, perhaps there is some small room for improvement there. Here is what that tab looks like as a span12 with the extra margin/padding removed:
Finally, and this looks like it might just be a themeify thing, but the menu color/edge transition feels off in some of the themes:
But looks nice with themes disabled:
Again, great work! I like having more room