Here's some other ideas I'd like to see on some future updates to AS, pretty please.
1. A "jump to date" feature. If I want to arrange the planets exactly where they would be at a given date/time currently we have to use the "forward" button and set the speed and fiddle with it until it's just right. It'd be great to just able to say "23 Mar 2235" and have it skip right to that orbital pattern.
2. A "course heading" feature would be great also. For example, suppose I have some ships leaving Mars and they'er heading to the Alpha Mensae system, it would be awesome to see what's the most direct path out of the system and what planets are near that vector. Currently I get around this by generating a sector map and looking at the angle between those stars on the map. Then, I generate the system map for Sol and assume that it's oriented to the same heading and use roughly the same vector to plot the course out. It's tedious, but for the level of accuracy/detail I'm shooting for, it's necessary. It'd be great to see that happen within the system automatically (maybe extend the "routes" to a specific planet to accomplish this?).
3. It'd also be great if I could put objects in orbit at a planets different LaGrange Points. As those are intrinsically gravitationally stable features within a star system they feature prominently in my setting, and in real-life science stuff too.
4. That whole "sphere of influence" feature on the sector map? That'd be great on a planetary scale. For example, if I had a bunch of satellites in orbit around the star it'd be awesome to be able to turn their "sensor range" on as a visible sphere so that I could better see what's in their field of view and what's not. That would make building a sensor grid and finding holes in it, etc.
5. Ships. It'd be super awesome to be able to move ships by a "heading" (laterally) and a "mark" (vertically) based on 2 intersecting 360 degree circles. Moving the ships around in the system free form is rather difficult under the current format...unless I'm just not understanding it.