Realistic sound should be on by default (or a variation of it)
The "no sound in space and combat" part of this is definitely a matter to debate, but at least consider the following, and I quote the wiki here: [...] an immersion option where certain sounds are more muted, pronounced, or available within an interior or cockpit.
Currently, everything sounds the same, whether you're outside/inside a ship, open/closed visor and so on.
I presume a lot of work went into this and this feature adds a lot of immersion to the game so I hate to see it completely under used. It makes the game more enjoyable if you enter a cockpit and the sound gets muffled.