There are no changes to MVP stats or mechanics. Only in DROPS. These customizations in drops are items that are usually found in the original game's Cash Shop -- and therefore deemed not broken. There is a plan to offer more "cash shop" items via Questing/Item Collection Quests as well.
Notes:
MVP maps are PK ON when the MVP is alive.
To check the drop rates of these items, the command in-game is @mi <monster name or ID>