I've done searching but didn't find anything yet on the forum.
I'm not sure if it has been suggested but i just got the feature idea comes from http://www.cnbeta.com/articles/233855.htm that my friend posted just now.
(The article is in Chinese so you might need a translator to read it. It seems the app is already provided by taxi company or 3 party)
There might be many ppl use waze in your country/area but not in ours. Adding more feature to attract different type of user would help a lot increasing user base
** New targeting user: taxi driver (help updating road), taxi passenger (won't help updating map)
and yes, some of taxi driver is already attracted to waze as they're driver anyway.
The new idea is, add a feature as "taxi service" mode (not taxi only route mode mentioned in some
post). and a "passenger request" feature
In taxi service mode, the taxi can be notified where a passenger wanting to be pick up (or even where they wanted to go, which is optional). taxi driver can find more business with waze than without it. This benefit greatly attach taxi driver to waze
when a user use "passenger request" feature, they're shown on map immediately for taxi drivers
a passenger may also use a more simpler interface (or another app) for this feature only