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They could have made it so that instead of initiating automated movement, selecting
vent opening would lock player movement direction into kind of turus that goes through
the vent opening... so forward would go through, backward would pull back and strafing
movement would circle around the opening... and when you go all the way through or
pull all the way back you return back to normal movement style...
But... Even this kind of system should be only optional... players still should be able to
go through those vent openings the good old fashioned way...