Storage chest, so you don't have to get rid of your precious Raven Armor and Aerondight/Moonblade and carry all the ingredients with you what you need later but not now.

Been suggested like a hundred times now, lol.

Is it?

Yup. On all the feature request threads, and several times on patch threads, and a few other rant threads.

By the way, adding a junk section to the inventory would be a pretty cool feature ;)

I hope patch 1.3 will include some interface tweaks - that's clearly the most problem-ridden part of the game, and 1.1 / 1.2 fixed very few things so far.