Well, I just turned my wallpaper to PNG format and decided to use lsplus. It was a slight workaround - I had to get it to make its own list of wallpapers (wallz.rc) and cut the code for the bang command out of there, then I was able to do what I wanted with a script, rather than the other method which was extra rc files.

Still, I am wondering, is it possible to code a bang command that runs from a .rc file? For example, execute the bang command on LS load.