Comment 9 for bug 30857

my understanding of it is this:
The trackpad is really attached via ps2 and when you disabled the input device you made the trackpad be recognized as this plain device without the extra features that it has and is given by the driver. You might want to check this by looking at your /var/log/Xorg.0.log. Anyway i tested my synaptics based laptop and it also has the 8px buffer and it is difficult for me to "accidentally" drag something i meant to click unless i really try to. Is your trackpad really sensitive? are you also getting a 8px drag boundary when you drag slowly? -mf