While I'm complaining about Google Maps...

... does anybody know of a way to say, "This direction you keep giving me is insanely, suicidally stupid; please stop doing that"?

The specific example is that GMaps keeps telling me to take Davenport Street in Cambridge, to turn left onto Mass Ave. Which is technically legal, but absolutely daft any time but the middle of the night -- it's turning left onto the busiest four-lane street in the city, without a traffic light. Given that I don't exactly drive a sports car, I feel like I'm taking my life into my hands every time I have to do it.

(Not to mention that Davenport Street is two-way, but only about a lane-and-a-half wide, so even getting down it can sometimes be challenging.)

And yes, I could just ignore GMaps and do something else. Problem is, the decision point for the right way to go in that direction is several blocks earlier. By the time I realize that I've been screwed yet again, I'm basically left going, "Ah, crap".

I just want the ability to retrospect on a previous set of directions and say, "That step -- that fourth line in the directions? -- never, ever, ever give that to me again. Just pretend it doesn't exist, and route me some other way." Conceptually that seems straightforward (I'm sure it is within Google's capabilities), but so far I haven't found any reason to believe it exists, and it's my single biggest pain point with GMaps...