I would love to see this, it’s annoying to have to sift through lots of crap and potentially miss something good. No, spam drinking potions or zooming in to see loot is not engaging gameplay.
- Buff/debuff duration icons (would like to see when my battle order/command is about to expire, or shrine duration…)
I’d like this as a toggleable option, it’d be very nice especially for shifter druids since they need to be in shifter form to attack.
I think I’ll have to pass on this one for both gameplay and “lore” reasons, people shouldn’t be allowed to teleport or charge around in town because it’d give sorcs and pallies an even larger advantage and it would disturb the townsfolk.
- Dummy in town with dps counter
Sure, though I think implementing something like this would take a lot of work and I’m not sure if it’d be worth the trouble.
- Sell super potions starting from nightmare instead of hell
Not sure what to think about this one. Indifferent.
- Remove jewel requirement when combining 3 runes into higher rune
I’d like to see this, yes. It’s just an annoyance and it doesn’t really facilitate trading either because nearly nobody holds onto the mid-tier gems, most of the time you just have to grind them out yourself.
I wouldn’t mind if they left the flawless gem requirements though, just get rid of the chipped/flawed/normal gem requirements.
- Change bolt/quiver to be similar to throwing weapons: can be normal / magic / rare / unique, can have increased stack size and replenish quality affixes, and maybe ethereal too
Again, not sure. It seems like bowazons are in a good spot after the 2.4 synergy buffs but I don’t know.
- More shared stash, or if it is due to technical barrier, change from 1 personal 3 shared to 3 personal 1 shared so that players don’t need to make so many mules
Modders have enabled more shared stash tabs in single player (up to 8 total shared stash tabs up from 3) so it shouldn’t be a problem from a technical standpoint.
I’m not sure if the shared stash suffers from the 8KB file limit that the save files (.d2s) do, so if they do then they’d need to up that to 16KB or 24KB so that people don’t lose their items. They need to fix the save file limit that’s currently an issue. 
- Stackable jewels and runes
I don’t think jewels can be stacked because they’re complex items (unless if you meant gems), I’d love to see stackable runes, gems, and keys but only in the stash. I think a stackable currency stash tab would be a great addition to the game to save a lot of space and mules.
- Shrine of stamina provides frw in addition to unlimited stamina, maybe +30%, and if possible, completely remove the stamina system and change the shrine to shrine of movement
Eh, it’d be nice but I think stamina is alright where it’s at. Not all shrines are meant to be useful in the late game.
- Item sort button in inventory and stash
I probably wouldn’t use it but some people could find it useful. Indifferent.
One suggestion I’d add is increasing the amount of online character slots to 50, 20 just isn’t enough.