Most of the stuff you noted is custom and were probably thrown on random servers by a dedicated programmer. That programmer after leaving most likely didn't release their code, or if they did, it may be stuck in a waiting line for an EQEMU-like dev to check it out and write it in.
That aside, item reward system is in I think, do a query of your database inside the variables or rule_values to find some data about PVP reward loot item thingie.. I've seen it there before, but haven't really messed with it.
When VZTZ went down they released their source here:
http://www.eqemulator.net/forums/showthread.php?t=29168
You can potentially use that to grab snippets of code.
there are no easy walk throughs if that's what you're asking for. You'll be delving into the source code for most of that, unless it's already inside PEQ, such as the item reward.
PvP code on PEQ is typically pretty bad too..