There are more choices to be made in relation to looting than just whether it get's picked up or not. Who has the potions? Who's carrying the coin and where? Who has the amulet, and do they wear it, or just carry it? Is someone using the masterwork longsword, or does it just get strapped to a backpack? Who's backpack?
All choices that can be made when I give them the list, regardless of what room they happen to be standing in at the time.
How do you handle it when the looting triggers an encounter that you don't want to give away by making the players play out the looting instead of just assuming everything gets found and taken without having to even mention it?
We just do it when I give them the list. If I am waiting for them to loot for some super-game reason, I just casually mention that there is something unlooted being left behind. It can even be something as innocuous as:
"Are you going to do anything special with the unlooted bodies or just leave them in the middle of the floor."
If they choose to leave them, then at least they specified they weren't looting.
Are ALL your characters always just as lucky and/or diligent as you? Does your SOP include who takes what, what gets taken and what gets left, how it gets stored in the character's inventory, and how and when it gets IDed and appraised?
In order:
In MMOs, I have never seen anyone leave loot intentionally without good cause. If you want to talk D&D again, then sometimes it happens due to the out of sight thing, but if you scroll up, I addressed that already.
SOP doesn't have to include who gets it. The party leader doles it out as I list it off.
Me: "Boots, masterworked"
Leader: "Jigger, hold those for now"
Me: "Headband, masterworked"
Leader: "Silinu, hold those for now"
Me: "Longsword, masterworked, glowing yellow"
Leader: "I'll hold that one for now"
Me: "Battleaxe, masterworked, not glowing"
Leader: "I'll hold that one too"
Sister Mel: "I cast detect magic and look at the equipment"
Me: "The Longsword, boots and headband all detect magic."
None of what I just described required a lick about the room the treasure was picked up in. And in the odd chance anything did, I would mention it.