I have a merged stylesheet now... I was wanting to see how easy it was to do it.
Of course, there are still 8 different files though:
Stylesheet (still needed to keep the main and tweaks seperate)
Large, Meduim and Normal (font size changes) - these I did not alter
Print, Bidi, and tweaks (really do not need to be messed with anyway) - these I did not alter
And I formed the one large on into a stylesheet I called main.
As far as I studied it, I haven't found any errors in it, though I could have missed over something...
Just take out all the imports from your "stylesheet", (except for "tweaks.css") and add in the "main.css"
But I do have to warn you, the file is pretty long now.