It would be a nice feature (suggestion by Ellpeck).

I personally actually (surprisingly) never liked that type of feature. I would prefer a Scroll Bar of some kind personally, and make the item some type of Magical Scroll (cause you're poking it to read different Categories, so naturally, it must be Magical lol). that's my input as a fan.

Pretty easy to implement, so why not.
@Blue64 I'll make it disableable if needed.