The EmulateWheelTimeout setting in xorg.conf doesn't do anything. 
eg, if I set it to 
Option "EmulateWheelTimeout" "250"
I still get the following in /var/log/Xorg.0.log
EmulateWheelButtonTimeout: 200

To clarify: the EmulateWheel function is working fine (i.e. tap button 2 ->
button 2 click; hold button 2 + move pointer -> emulate scroll). But I can't
change the timeout from the default.

[In my case, I'd like to set the timeout to 0, since I already have a middle
button via Emulate3buttons. This makes sense because of the unusual layout of
buttons on the thinkpad:   
    Btn_1   Btn_3
    B_u_t_t_o_n_2
]



I'm actually using this version of xorg:
xorg-x11-6.9-0.cvs20050825.1mdk    (Mandrake cooker, aka 2006 Beta 3)
So, sorry if I've picked the wrong version above.

Here's the relevant snippet of my xorg.conf


Section "InputDevice"
   Identifier "Mouse1"
    Driver "mouse"
    Option "Protocol" "PS/2"
    Option "Device" "/dev/psaux"
    Option "Emulate3Buttons" "on"       #Button 1+3 => emulated middle button
    Option "Emulate3Timeout" "50"
    Option "EmulateWheel" "on"          #Button 2 => emulated scroll wheel.
    Option "EmulateWheelButton" "2"

    # Option "EmulateWheelTimeout" "200"  #If button 2 is pressed for less than
this time,
    # then the original button-2 press will pass through. Otherwise, we get
emulated scroll.
    # the default timeout is 200, and any other setting seems to be ignored!

    Option "YAxisMapping" "4 5"         #EmulatedWheel vertical/horizontal
pointer motion causes fake button 4,5 or 6,7 presses.
    Option "XAxisMapping" "6 7"         #Map these fake presses to vertical and
horizontal scroll respectively.
    Option "ZAxisMapping" "10 11"       #Map this out of the way, or the default
(6,7) will break emulated scroll.

EndSection


P.S. I hope this bug report helps. If it is inadequate, I'd welcome feedback on
how to submit a more useful one.

P.P.S. Is it normal for ZAxisMapping to interfere with EmulateWheel? The
ZAxisMapping above is required!