Moveable Type GUI

I finally got the Moveable Type stylesheets installed properly and now when I post to the blog, I get the full GUI where I was getting nothing. One thing I particularly notice about the default stylesheet is that it is a bit dim. The text is about 80% black against 10 or 20% grey backgrounds, it lowers the contrast sufficiently to make it a bit hard to read. The first thing I did in MT is fix the blog stylesheet to make the text 100% black so it would be easier to read. But alas it is not so easy to modify the internal operations stylesheet.
I'd like to make a few mods to the function of MT, I'd like it to automatically create new links that open in new windows. It's an easy mod to make, if I could just figure out where to put it.