While the Loremaster currently has both a Scroll and Wand Mastery, which are very thematic and flavorful, I wondered if it would be possible to extend that to books with charges.
I can see why it would not work, as scrolls and wands are distinct items which can be targeted more easily by the scripts but books are miscellaneous items, so without some hardcore coding and filtering, it would likely affect all items with charges.
However, with that in mind, why not simply allow the Wand Mastery to affect ALL magic items that burn charges to cast a spell? It could be renamed to Magic Device Mastery, since many do require UMD to use if not required class/alignment and wands fall under UMD as well, so it makes sense as a blanket ability for items with abilities that burn charges.
tl;dr Turn Wand Mastery into Magic Device Mastery and affect all items with spells/charges.
Loremaster: Magic Device Mastery
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Loremaster: Magic Device Mastery
Narcisse, Gnomish linguist and booper of snoots.