Message Display isn’t a bad idea, you can always filter out your chats for now by right clicking the tabs.
Main thing bought in the slayer shop is the mace, craw’s bows and imbued hearts, most people tend to do slayer for profit but new items for the shop is never a bad idea.
Slayer cave: High risk high reward factor as most of the normal spots were people tend to do slayer are packed and the cave is way more efficient.