Help with Joystick UDF

[scipy 0]

I have a question. Which command would one use to send an "axis press"-type action? For example:

if $coord[$i] = "16" Then
           Send("{c down}")
           sleep(10)
           Send("{s down}")
           sleep(5)
           Send("{s up}")
           Sleep(10)
           Send("{c up}")
           Sleep(100)
EndIf

Now, instead of sending a keystroke for C, I'd need a command that would press and then release one of the axis to a certain value (from my understanding this ranges from 0 to 65535) but I'd like to be able to press only 50-80 % of the full axis travel.

If anyone has any idea, I'd be very grateful.