The "best" route is often a matter of personnal compromise.
It's often a mix of fastest, shortest, and more and more road cost / fuel economy.
I suggest we add a "Mixed" routing strategy, that could follow our preferences.

We could think of a system starting with 100 points that the user would share among the different "strategies" of routing.

For instance, one could set :
* Fastest : 50 points
* Shortest : 30 points
* Economy : 20 points.

That has the big advantage to allow other routing strategy for future.
* Less traffic lights : 5 points
* Less train crossing : 10 points
* Nice points of view : 5 points
* etc...

of course, total points would always have to be 100 points. As i said, routing is a matter of compromise. :)

I hope this can help waze users and developpers.

Best regards