Enable your cursor, and "double tap" to "zoom-in". Not sure about "zoom-out".

*** edit - Maybe one of the number or letter keys. I'll have to check the default's on my g/f's e71.

Regarding your "long and boring" post, , I'd only use the 900 and its GPS/google maps, to find POIs, or if I'm out of town and "on foot". For actual driving directions, I'd rather use my car's AVIC or Garmin...but I understand not everyone has these options. However by default, I would never rely on an "all-in-one device" to provide stellar results, in all situations, despite its "handiness".