Saving the state of a map when leaving

[burge4150]

Maybe not the best thread title, but I have a question.

When things happen in a map - doors are opened, bottles fall off a shelf and break, and items are picked up - a lot of it resets once the player leaves a map and comes back.

From what I can tell:
Items picked up stay gone
Doors Opened will reset to be Closed
Lights that have gone out will stay out
Bottles or Items that fall off a shelf will be replaced onto the shelf

What causes these items to reset, and is there a way to save the state of a map once a player leaves it?