Food
Any buffs would have to be REALLY good to be worth taking a debuff for. Otherwise people will just do what I'm doing now, which is ignoring the food in favor of other methods. Any debuffs would have to not cancel out the benefit (A +5 STR / -5 CON food for a frontline warrior is bad, a +5 STR / -5 INT food is good)
My idea for food is to have it heal a bit each turn, to make the strategic choice between a potion for a large chunk of instant healing or a small amount each turn for several turns. It also probably needs a stat buff as well because you get a lot more attribute points than in D:OS 1 - keeping the same values for food makes them worse in comparison.
Potions
The problem with cure poison potions is the exact same problem with cure poison potions in basically every single RPG: The enemy can usually re-poison you effortlessly, making the potion a waste of an action. Cure Poison should not only cure, but give you a 3 turn immunity to poison.
Scrolls
I don't think Scrolls need any more changes. The addition of Memory and being unable to respec skills mid-combat makes scrolls much more useful than they were in D:OS 1. I disagree with a one-scroll-per-turn limit just because of Memory alone.
Grenades and Special Arrows
Honestly I didn't bother using these even though I had a Rogue and Archer. I was doing good damage with normal attacks and Height Bonus + Flesh Sacrifice arrows that it didn't feel needed to do special attacks.
But I guess increasing the AP cost sounds good if they're a problem.
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The quick item bar idea is interesting, but I haven't decided if I like it or not.
Food: Interesting idea, but I still prefer mine because in my opinion the constant healing effect would make eating a no brainer. I mean, in your scenario I would always eat something before entering a fight, and then- when I'm forced to - I would use potions neglecting the effect of food.
As for my solution: yes, I was thinking at something very impactful, like in the examples you made.
Potions: Agree. Anything that makes potions more useful (at a cost) it's more than welcome.
Scrolls: Aside for the fact that at the present anything remotely related to memory needs to be rebalanced (memory cost of skills, stat cost of memory slots, etc.), I've already suggested Larians to allow players to switch skillset in battle, at the cost of an inactive round though. This should keep the strategic value of the mechanic, while allowing for more flexibility.
In this scenario, I think that a scroll cooldown (or a quick item bar) would work fine.
