Thanks DJFozz.
I made a movie
here of a run up to Doom. i havent actually tried to beat doom with only fists yet, so i dont know if it works or not. But it shows how a run could be made - its pretty straightforward, it just takes a lot of planning. Once the game starts all the items are locked in place, so i went everywhere and found every item, then tried to map out the fastest route. Once i can get the whistle to work it would probably be best to find a game where the whistle is sold first thing in the store, and get it immediately.
The driving can probably be cleaned up, and at one point i actually passed a car without hitting it, so maybe its possible to do that with every car. its also hard to plan the quickest route because Benny gets bumped around as soon as you get out of him. In this run I also manage to avoid running into Psycho.