Basically, difficulty sliders like Fell Seal for stuffs like, sell price, enemy AI level, enemy hp modifier, boss hp modifier, higher quality items spawn chance, hit chance and any other stuff the devs or players can think off.
PS: We really need to be able to order specific quality items, such as ask a specific merchant to give us a specifically 110 quarter item at a 150% markup, this would help cut down on cheat engine use massively in my opinion.
Also, feel free to add your own suggestions here so we will have an easy reference for the devs, I will edit this main post as we think of more suggestions