Relatively simple:
Measure the amount of of time it takes a heavy to walk from the start to the end of the shortcut. Put a trigger at the start, and set it so that after that amount of time the door at the end of the shortcut will open for 5 seconds. That way other classes can use the shortcut, but will be slowed down to the heavy's speed anyway.
Measure the amount of of time it takes a heavy to walk from the start to the end of the shortcut. Put a trigger at the start, and set it so that after that amount of time the door at the end of the shortcut will open for 5 seconds. That way other classes can use the shortcut, but will be slowed down to the heavy's speed anyway.