Hello SevenUser09
If you install
AutoHotKey you can create a script with this code. This will disable shift clicking to open a new instance.
Code:
+LButton:: ; Shift + LButton hotkey.
MouseGetPos,,, win ; Get window under mouse.
; If this window is the taskbar, mode:="", otherwise mode:="{Blind}".
mode := WinExist("ahk_class Shell_TrayWnd ahk_id " win) ? "" : "{Blind}"
Send %mode%{LButton Down} ; Click down, filtering out Shift if mode="".
KeyWait LButton ; Wait for button to be physically released.
Send %mode%{LButton Up} ; Click up.
return Hope this helps.