Rapping the table when it is your turn to act, has always been accepted as a check. I suggest that it be considered at the next summit. Adding it to TDA rule #3. Official Terminology/Gestures...
I would also like feedback on adding it to #34 Verbal Declarations/Gestures.... and putting Acting in Turn separate from verbal, possibly something like #35 Action out of turn/Action in turn...
It is certainly not the most important issue for discussion, but one that we should consider. Is there anyone that ever played poker, that hasn't used that gesture, on occasion to indicate a check?