If you can see orbital units travelling through space with your radar (or even your own units) would it not be unreasonable to be able to predict the point where they will become 'inserted' into your planet's orbit. By adding a floating insertion ring or something that's colour coded to the unit(s) arriving into your planets orbit, you'd be able to see ahead of time where you need to focus you attention for the attack/defense of the planet. (it's easy to lose track of where exactly you sent your orbital fabber to queue up tele's and whatnot.) You could have it appear only when holding down shift so as to not clutter up the screen when you don't need to care.