Press and Hold Button

Hello all,

I'm trying to make a toggle button that when enabled will allow the next click to mimic a left click without release operation (ie. a press and hold).

The way I'm trying to approach this is to disable the "MouseUp" functionality when the toggle button has "press and hold enabled". I haven't been able to find a way to do this... Can someone help me out with that or direct me to a better approach.

Thanks,
John