Settings-pages are added by adding two files to specific folders. That's something an rpm can do without causing any problems and the launcher-combined-patch-repo that I linked is a pretty good example for what anyone that wants to add a settings page has to do (Adding settings-pages is fully independent from prepatch).

Building a prepatch-patch-rpm is pretty straightforward. Just follow this guide and run the mb2 ... build command from the directory of the patch. My prepatch-patch-repos can be used as reference. If you want to build an rpm for any other patch you simply have to replace the patch and one line in the spec-file.

Everyone who wants to!
It's pretty easy and if anyone has trouble with the process I'll gladly help.
So far I've only ported some of my patches (mostly as a reference) but as long as the original dev has no problem with it anyone can also port patches from other devs.