This probably was not included as part of the game because there is no game benefit to flooding your tubes only. Yes, that was necessary prior to opening the tube caps and outer doors, but I'm guessing that the developers looked at the 'Q' key as a combined 'flood-tube-then-open-door' scenario. Possibly also why there is a small delay for the door to open: a few seconds are needed to flood the tube before opening the outer door.
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