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what would the dooruse.fpi script be to spawn doors in the open position. or how would one have the map load with all doors open?

Dooruse ables you to open doors yourself.
I don't know if this is a satisfying answer for you, but have you considered using autoor.fpi? (right click door, main script)
That way you have smooth and fast gameplay, doors open automatically, close behind you, if you use dooruse and you have a weapon in hand and someone is chasing you and you're low on health you probably don't want to risk to manually closing the door, you would run but the door would be open, now imagine the door being shut in time, you now have your back covered for a few more seconds, and in multiplayer it only takes a few seconds. It always does.
Just an idea though, and a lot more doors stay closed instead of most of them being open by the end of the round/match.
I know that this does not really answer your question, i'm just saying this is how i would do it in multiplayer.
In singleplayer however, i would use dooruse, then it's easier to tell which places you have been.
Gl.