Since the documentation isn't very helpful yet, I'll ask some things I need to know about plasma themeing to finish this theme here

how can I disable text shadows? I want a gray font on a black background without a white glow behind it

how do I use margins? I can use them to make shadows that aren't blurred, right?

can I disable blur in parts of the theme (or the entire theme)?

can someone explain what is what in the colorscheme? the buttons and lineedits seem to have the same font color?

I would recommend asking in #plasma on Freenode, or asking on the Plasma Development mailing list - plasma-devel@kde.org.