I'm not a 100% but I believe Dorg mentioned that the cards actually activate the crafting system and that a book that does all in one would be at best very unwieldy, horrific lag at the worst. I like the concept myself, but implementation is the issue if I recall correctly from past threads.
This was discussed earlier here:http://forums.layonara.com/nwn-ideas-suggestions-requests/228412-combined-crafting-cards.htmlAnd you're right the main reason for not doing it is the lag the script would cause as it is the same as opening one of every type of crafting device. Would be nice to have though
I wouldn't mind an offline version for reference.
Little spiral notebooks are a great place to write stuff like crafting recipes or info from long quest series