Once on redar vectors to final that's our cue to extend the centerline from the most likely waypoint that you'll actually fly over. It is always important to keep the active waypoint in front of you for GA purposes. Especially when the GA is exceptionally challenging.
It's always nice practice to avoid the following scenario. "Gear Up, LNAV" Oh crap! The active waypont is behind us! Where the hell are my charts?! Where's my maplight?! Help me MR Wizard! I don't want to be a jet pilot!
As an aside, when things really get hairy. Go straight up as fast as you can. Full power and pull to just below the PLI. That's my emergency missed approach procedure. Hope I never have to use it.