Trying to do this strikes me as "Battlecruiser 3000AD syndrome"--you cram so many different mechanics and elements into a mod that the quality of the various elements suffers horribly and you end up with a borderline-unplayable final product consisting of multiple games mashed together.
Also fighter pilots don't participate in infantry combat. They just don't. Ever. That's not their job.
What you could do is have MMU pack (jetpacks in SPAAAAACE, and they're real!) combat, where you have a spacesuit with a jetpack and a bunch of guns on it, and fly around an interior space Descent style. Have extremely low turn times and damp values and allow the player to slide in any direction. This would require massive amounts of new assets (jetpack doodz, level geometry, etc.) and the AI would have...problems, but at least it's theoretically possible to accomplish in FSO.