Mike and I had a look at the Lurker sheet today and agreed that it could indeed use a little improvement. A spot for recording Plot Points is a definite go, but outside of that, we'd like to know what everyone else might like to see. Once we have a little more feedback, we'll do a redesign on the sheet.
Do note that this is going to mean reducing the number of Lurker entries on the sheet from eight to six, which shouldn't be a problem provided you don't mind using a single entry for multiple Lurkers of the same type, at least in larger games. It's not like every Cultist really needs their own record anyhow.