Pretty sure there is already a generally accepted standard for NPC Ids, and Item IDs. 13th Floor items I believe use the same itemID you find in the live game - or it's an amazing coincidence that all my magelo gear IDs match items in EQEmu's Items table. And NPCs standard numbering is zoneID * 1000, with the first NPC ID for zone 123 being 123000. etc. Fairly sure people have tried to keep mob-specific IDs to this scheme too, though some mobs (like a rat) can spawn anywhere.
Bottom line is, your first statement was accurate indeed - open source, anyone can and will do what they want. But those who feed BACK to the official PEQ project need to follow their guidelines, or it won't become part of an official release. And very few offer their changes because many tweak for customization anyway, and again, the core project is "Live-like"...
Guess I am saying, I think we're fairly standard already.
but always a good idea to remind the new folk.