Rothy,
we plan to have zooming in the next major release, but it may be limited to higher resolution displays (VGA). The Point why we did not supported it in the past is the fact that on low resultion displays the map immediately becomes unreadable (just as in eagles view) if you start to zoom out a bit. Anyway, we have it on the list for Pocket Mindmap 2.0.
Thanks for your feedback!
Rolf