ok i've successfully managed to get an older version of it working with tekkit. it's RC3, so it's without the fancy reflections sadly.
I've also managed to get all the faithful texture packs for the mods together for a complete higher resolution tekkit pack.
I'm going to assume that I can distribute this file called "modpack.jar" because it doesn't contain anything by Mojang and is distributed by tekkit anyway. The only things changed are Optifine to the Ultra version with multithreading and the addition of Sonic Ether's Shaders.
EDIT - This will only work for ATI video cards. Nvidia support isn't properly working (if at all). hopefully he gets that ironed out in the next update, but we still cant use it for tekkit until it goes 1.3
link is:
http://www.mediafire.com/?f00zpm2rbvcdqdjplace the modpack.jar in %appdata%\Roaming\.techniclauncher\tekkit\bin
and obviously the texture pack where it should go too.