new highcontrast widgets?

Hi all!
I wanted to investigate if we could get rid of all our Close-buttons in 
some windows, since every window have a big close button in the top 
right corner anyway. (therefore less clutter)
A big stopper for this was apparently the highcontrast themes, where the 
close button in the corner hit target is pretty small apparently.

Would something like this be doable?
http://andreasn.se/diverse/temp/hc.png
- Andreas