Okay, something a bit more realistic than then last set:
A star how far QOL: Display secondary star distances from the primary in the system diagram (that thing ain't a map...). Why can it show ONLY the planetary distances? Stick in a star or an oversized gas giant or failed star (brown dwarf) and suddenly the ship cannot display the distance from the primary in the system diagram. Broken since launch. Plz fix.
Orbital Path of the Binary: Binary objects orbiting another object follow an orbital path. Yet, according to the orbital line displays in our ships... they do not. They are free spirited astronomical bodies merely visiting the local space time continuum. If there is a need to differentiate a binary (trinary, etc.) orbital path, make it a dashed or dotted one instead of solid. In fact, that may be ideal.
Orbital Path of the Undiscovered Country: Perhaps the orbit lines of system bodies can be colored (coloured?) in a different manner to denote those that have not yet been scanned? Maybe gray/grey vs. orange?
Go AWAY orbital insertion data!: So, ever since Horizons landed, the planetary display to the left has been hijacked by the approach speed indicator. While approaching to land, this is valuable data. While exploring... this is highly annoying as NOW, one has to jump into the system diagram in order to see what is what about that planet. But only if the planet is one that can be landed. Other planets continue to show their colors (Earth-like! BooYah!). My suggestion: so long as a firegroup with a Basic, Intermediate, or Advanced system scanner is active, the approach speed graph is disabled. Switch groups to switch displays. Alternately, allow the display to be toggled between the states with a hotkey (a better solution IMO). Or, have it as a setting in the systems panel (a poor choice IMO, but better than what we have now).
Too Late!: Change the "Slow Down" alert that pops up when you are speeding past your destination to "Too Late"... since, you know, by then it is too late to slow down... Or, better, change the timing so that it isn't popping up too late...