Marking up slides during presentation -- double-click problem

[spaz_attack]

Hi, I'm using PowerPoint as a teacher and I like to use the pens during
presentation to mark up my slides (e.g., the felt tip pen). I do this using
a Wacom Bamboo tablet. However, I have a big problem which is that if I
click twice in rapid succession (e.g., when drawing the letter "i")
PowerPoint treats this like a double-click and does some kind of very bad
curve generation that totally corrupts what I'm writing. I've turned down
the double-click interval on the tablet preferences as low as they will go,
but it doesn't help much.

Is there any way that I can tell PowerPoint to stop interpreting a
double-click as a command to make a curve when marking up my slides during
presentations? I want it to treat every click as just a click -- to
completely ignore double-clicks.

Thanks!