How will you be implementing 6e's new rules for "limits on play?"

My group tried the "raising your palm in a STOP gesture", but one of our heavier players said her arm gets tired very quickly raising it over 90 degrees so I wanted to respect that. I think the "touching a designated object" is probably the best and most respectful way to go. What's a good object to use for this purpose? It should be something small that doesn't take a lot of table room but also something that won't be touched accidentally, lend itself to be fiddled with, etc.?

Also we will be using the "friend has permission to use the signal on someone else's behalf" rule. Our neurodivergent player is easily intimidated and has given the heavy player permission to STOP on her behalf, though I'm a little concerned he may abuse that power.

Anyway these are the new rules and no, you can't opt out. 6e is all VTT and you will not be allowed to play if you don't agree to their terms and conditions.