Why does selecting text in presentation mode select all text?

[Sascha Heid <saschaheid gmail com>]

Hi List!

Is there a reason why selecting text in presentation mode immediately
selects all text of the page?
On a Tablet-PC (or other pen-driven device) this makes
presentation-mode impossible to use because you can not just click
with a pen without also moving it and thus you end up selecting all
text instead of going forward/backward in the document.

Regards,
Sascha