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Agreed. That's actually what Igarashi's original speed-dependent automatic zooming HCI technique is doing [1] (abbr. SDAZ). ZGRViewer's behaviour is inspired, but not equivalent to, this technique. It was just a quick hack to demonstrate the easy feasability of such things with ZVTM (the toolkit upon which ZGRViewer is based).

[1] http://www-ui.is.s.u-tokyo.ac.jp/~takeo/research/autozoom/autozoom.htm

I'll eventually implement the full SDAZ behaviour, but this is not top priority.