Right now, different voices and languages have different hidden features - like calling out segment length, different distances, street names, lane separation and so on. There's no reason for this discrimination. You should have all of the features available on all of the voices and have them toggle able.

So, for example, all male voices should have the option to speak Street Names. Also, ALL voices should count more Distances. It's ridiculous that a turn within 100m will be called out as 400m ahead, it's confusing and could cause a ruckus on the road.