I routinely play stacked and regardless of the queuing, I tab through the stack a few seconds at a time to keep an eye on how that action is progressing, and when new cards are dealt, because I don't like having the pop-up be the first action I see if at all possible.
I added a line to the script that allows me to hit tab and cycle through all of the windows. The command is (Alt-Esc), so it was the equivalent of tab=alt-esc. (I'm at work now, and don't have the script here to tell you the exact syntax).
I'm confident that I could run 8 tables even without the queuing just with the tab key. So, if
Ongame, or whatever, doesn't have queuing, you can still stack.