yes it is hard to get accurate by turning the knob with your mouse, you should be able to click on the caption and change it manually but they didn't do that in the dly^.exe.
You can try
https://sourceforge.net/projects/automousesw/?source=navbar or
https://autosensitivity.codeplex.com/ or
http://www.eithermouse.com/to change the sensitivity of you mouse, so you move the mouse, it should have a hot key you hold while moving the mouse.
as well you can use an autohotkey I found here
http://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=308660#Post308660just run the auto hot key - right click on the little H in the system tray at the bottom right - Edit Script - copy and paste the script below overwriting the current and save - right click on the little H in the system tray at the bottom right - Reload Script
by pressing ctrl + shift + m (toggle fast slow) (change hot key ^+M::)
you can change the mouse speed to give more precision
; GET INTIAL MOUSE SPEED:
; 0x70 (SPI_GETMOUSESPEED), third parameter is the speed (range is 1-20, 10 is default)
DllCall("SystemParametersInfo", UInt, 0x70, UInt, 0, UIntP, Mouse_Speed_Orig, UInt, 0)
Mouse_Speed_Slow =1
;Mouse_Speed_Slow := Mouse_Speed_Orig * 0.75
;Mouse_Speed_Slow := Floor(Mouse_Speed_Slow)
; Or directly set the speed: Mouse_Speed_Slow =5
Return
^+M::
; 0x71 (SPI_SETMOUSESPEED), third parameter is the speed (range is 1-20, 10 is default)
DllCall("SystemParametersInfo", UInt, 0x70, UInt, 0, UIntP, Mouse_Speed_Now, UInt, 0)
If Mouse_Speed_Now =%Mouse_Speed_Orig%
DllCall("SystemParametersInfo", UInt, 0x71, UInt, 0, UInt, Mouse_Speed_Slow, UInt, 0)
Else
DllCall("SystemParametersInfo", UInt, 0x71, UInt, 0, UInt, Mouse_Speed_Orig, UInt, 0)
Return