Knowing everything down to 100% accuracy like how to gain immortality, but needing to activate it through writing the question, then being able to retrieve said knowledge (which can be brief or in-depth depending on the intention) by writing the answer, and I will also retrieve answers most relevant to what I want to know. Optional omniscience, so it doesn't make your head explode.
But if that's too god-like, being able to read 3000 WPM and still understand/comprehend what I'm reading at that speed, as well as still engaging with my thoughts on what I'm reading.