Yes, it would be nice.
Here is how I do it:
Red= Base Launch or Entry, or Docking Manuever (<100km)
Amber (it is amber, BTW)= When ECC >1.0, but still within a planet's SOI.
Green= When in Orbit around a planet, and completely within it's SOI.
Blue= During Taxi, or while in the Sun's SOI (in...