The thing is, I'd at least want the mathematical rule governing speed versus mass proximity to stay internally consistent, so bringing up the interstellar speed massively would mean bringing up the interplanetary speed massively too, and right now, I think the latter is already tuned pretty well.
Did you play with a HOTAS? I lined mine up to match the virtual positions, so the feeling of presence was insanely good. This is making me want to set that up again, which I should probably do anyway for an Index/Frame comparison.
And yeah, the lack of mod support is a shame.