Holding your breath

[atomic1fire]

Just make clicking the O2 Button hold your breath, in addition to a hot key for keyboard nerds.

Cue dummies leaving it on too long and passing out.

Addendum: To go with this a Diver trait that lets you hold your breath 30 seconds longer. Something that might be useful if you plan on traveling through space a lot and are willing to spend trait points on it.