Saluting is already the only possible input except pause in the droppod and except pause and walk on the space rig.
So what if we could always salute? Just think about the posibilities... Unlimited salute. We could even salute while we're
- holding an empty mug
- carrying a heavy object
- mining (With our left hand?)
- shooting (with our left hand?)
- using the terrain scanner
- in the mission result screen
- doing a power attack (just shouting at first and then shortly holding the pickaxe up after we're finished?)
- down
- being carried by a grabber or cave leech
- frozen (ok maybe that's a bit too wacky)
- loading for a mission
This would definetely add a lot of charm to the game imo.
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