Popsicle stick or penny trick just means using a stick, or penny or using keycaps to bind two or more keys together so you press one and multiple keys get pressed/sent. It's the argument used to justify sending multiple, non-concurrent inputs at one time.

He doesn't want to glue stuff to his keyboard, he just wants to know if this "spray and pray" method as I call it is something that they detect and ban for so he can it through ISBoxer for solo play.

As far as answers, I posted what they call an answer in the Multiboxing Allowed thread earlier. We've only seen one post about boxing and bans come up here and there likely had nothing to do with ISBoxer or the Framework and was likely due to other stuff.