congratulations!
the most important thing i do with mine is implementing 2500 char limits (anything is better than the default). that has to be re-applied with each patch, annoyingly... and every now and then, the implementation changes so I have to rewrite some of the code.
i also made changes to the defaults for image and video sizes, since i tend to post stuff much larger than the default maximums
aside from that, upgrading is (usually) a cinch thanks to well-written install notes.