Feature request: Right-justify icons inside fence

I have several fences on my desktop inside which I would like to be able to right-justify all the icons. The current behaviour is to left-justify everything, which usually looks good; I'd love to be able to hit the config menu or the rules tab and set up a rule, or choose an option, on a per-fence basis.  That is, I have icons on the left side of the screen left-justified in their fences, and I want fences on the right side of the screen to right-justify their icons.