sorry! this is a bug based on how many events the mouse is firing and I've open an issue for it -- I will take a look at the app with a gaming mouse and work on a fix.
My utterly ordinary "Microsoft Optical Mouse V2.0" draws lines about 1"/100 pixels long when moving at normal speeds. I've been trying to draw Michigan, but utterly unable to get a thumb on the lump.
The spec sheet [1] describes a resolution of 3000 FPS/800 DPI.
[1]: http://download.microsoft.com/download/A/E/B/AEB70318-6FE3-4...