mouse wheel events?

[Tom Horsley]

Is there something in evdev somewhere that needs tweaking for
mouse wheel events? It seems like I have to furiously spin
the wheel (actually it is a ring around the ball on my trackball)
for apps to pay attention and start scrolling.

If I run xev, however, I see the button 5 and 4 press and
release events without any furious spinning of the mouse.

Are toolkits trying to collect enough events to make
sure I really meant it before they start scrolling or what?

Just curious here (but hoping there is a setting I can
tweak :-).