taultunleashed

So you need AutoIt
you need Diablo 3 Window Mode 800x600

you need any stackable item

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#include <Misc.au3>

Opt('MouseCoordMode', 2)
Opt('PixelCoordMode', 2)
Opt('MouseClickDelay', 0)
Opt('SendKeyDelay', 0)
Opt('SendKeyDownDelay', 0)

Global $iNumber = 999 ; number inputted after shift-clicking to resize the stack.

WinActivate('Diablo III')
While 1
If WinActive('Diablo III') Then
If _IsPressed('BB') Then
Send("{SHIFTDOWN}")
MouseClick("Left", 770, 337, 1, 0) ; Clicks on item.
Send("{SHIFTUP}")
Send($iNumber) ; Inputs $iNumber variable.
Send("{ENTER}")
MouseClick("Left", 770, 363, 1, 0) ; Clicks the slot below first item.
MouseClick("Left", 105, 490, 3, 0) ; Clicks the accept button.
While _IsPressed('BB')
Sleep(50)
WEnd
EndIf
EndIf
WEnd
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Copy the code above in an Auto It script i have it compiled ill add it

1. open a Trade with someone, place your Stackable item in the trade window
let them place there item, Let them hit accept first then press = to activate it will reduce the stack to 1 move it and trade them
only 1 item out of the stack !