Something that I would like to see is the ability to use a header that is taller than 175px
It would be nice if the theme allowed the height to be determined by the height of the image when you upload the header into the theme. I normally make my headers around 200 depending on the images that I am using in it.
I tried inserting one of my headers in that was 950 by 200 and it cut a larger portion off of the bottom of the image.
Not sure how hard that is but I imagine it isn't too hard.
Just edit the css height, if you send me your wp login info privately I can fix for you... than I'll add a tutorial here...