[Suicide Junkie]

Much of that is way out there...
Some things of note:

#9: you've just said yourself how to do it.

#10: This would be less modding the warppoints, and more adjusting the units (which can be specified whether they can warp or not) You could turn all the ships into units if you wanted, and work from there.

#7: Sure, see PlanetPhysicalTypes.txt

#1: Slowly? There aren't that many hexes in the close orbits.
Moving planets would make systems hell to navigate, too.

#3: Last I checked, unmapped systems do not appear on the galaxy map in SE5.