Dev I hear ya, but some direction is helpful...

Wolvez:
Go in the folder you installed litestep.
Look for the themes folder.
Look for Austerity folder.
Look at the theme.ini file and open with notepad.exe
Copy and place this file in each theme folder that does not change wallpapers.
Some themes use lswallchanger.dll or similar to change walls without this file, so be careful...
Make sure you edit the path to your wallpaper you want in each one tho..