[seanp2k2]

I still want the ability to add a destination en route to another destination, e.g. "Ooh, I need to find [cheap] gas on the way to my next errand". It'd also be nice to be able to plan out e.g. "I need to go 4 places, figure out when they all close and what the optimal route is between them all". These are currently very manual and pretty tedious.

[foobarian]

I wish one of these traffic apps had "race mode." The traffic data is mostly worthless because it's not real-time, and even when it does give a good route it's hard to confirm it after arrival. Instead it would be cool to compare my route to an alternate traversed by another app user who left the origin around the same time.

[sib]

Waze enables this (add a destination en route to another destination) pretty seamlessly for a single additional point. They don't really do multipoint trip optimization afaik.