The ability to become a scribe and create inscriptions with various inks and paper. You can collect ingredients from the world, bring them to an inscription table and create an assortment of inks, if you have an empty inkwell on you. The most basic "ink" could be charcoal, used for the most basic inscriptions. The input would be like the alchemy table; match up ingredients and they produce an effect in a bottle. Once you have your inks, you will use blank paper at the inscription table to create a scroll or spell book of your choosing. Specific inks are required to make specific scrolls/spell books. The perk tree would be similar to the smithing tree and the enchanting tree combined.
The similarity in the smithing tree would be that each perk point you spend, you will be able to use higher leveled inks and be able to create higher leveled scrolls and spell books, such as "Able to create novice - master level scrolls/spell books (per perk, and they would be in accordance to the novice - master level spells).
The similarity in the enchanting tree would be that you have your separate effects as perks, such as "Inscribed scrolls are x % more powerful", "inscribed scrolls that deal fire (or frost or lightning) damage are x % more powerful", "Scrolls that increase armor rating are x % more powerful", "Scrolls that heal you and those around you are x % more powerful" so on and so forth.
I'm not saying that Bethesda should listen to me and put this in the game or anything. I just think that this would be a pretty cool skill to put in so we can use up some of that paper laying around, or if I don't feel like playing as a mage/mage hybrid. What do you guys think? Feel free to expand!