Several Questions...

[MarvinCZ]

1) I'm pretty sure some other mod does that, Discovery chose not to (it was suggested a few times).

2) We know that it's possible, but we didn't apply it to old systems. The reason you gave here seems compelling though. It might be worth it to move a few systems slightly to make the connections visible. (btw, don't call it "less static", that's confusing because the suggestion doesn't include any activity of the map)

3) Treewyrm tried creating special mission types, I don't know about anybody else.