Happy anniversary, Marathon!
Marathon was released on December 21st, 1994. That means the game turns 21 today - legally old enough to drink in the US (and it could probably use a drink after seeing Ling Ling's head).
I can think of no better time to share the work I've done with Better Bridges, which creates the illusion that Aleph One can do true bridges.
You may have already seen the screenshots from Halathon, but what I've done now is extracted out Better Bridges to work independently for any scenario that wants to use the technique. I've endeavored to make it as easy to use as possible.
Head over to Simplici7y to download the sample map and detailed user's guide.