Read the manual. The tile horizontally, tile vertically, and no tiling tweaks may require you to edit the background color, as the bitmap fill does not cover entire window in this case. If you use the WD7P tweaks in WD7, you will not be able to edit the code as described in the manual. But WD7P tweakset has some new tweaks not present in WD6 tweakset so you may like to have them.
Do not remove anything. Just install both tweaksets. You'll be able to use any tweak from any tweakset this way.