Add to compatible items shields, tridents, fishing rods, flint-and-steels and shears. Many servers use custom-modelled items and weapons based on last two items, so, it will be great option, if we can protect this items too.
Add levels, which can acts as "use counts" or (better) "percent chance" for Holy White Scroll. I mean "Holy white scroll V" will save protected item five times, before burns-out, or can keep itself on item with chance 100%, while "Holy white scroll I" will keep itself on item with chance 10% only.
Currently it's designed with CosmicPvP's style. You can add compatible items by editing http://prntscr.com/nnlr7o list, but the second suggestion will not be added, sorry!
Feature suggestion for HolyWhiteScroll: