Several years ago, I saw an article from somewhere (A LOT of help I am) that discussed either a rule or an interpretation of slow play for this exact situation. If I remember correctly, it was discussing new rules or new interpretations that would apply to the WSOP that was soon forthcoming. I have looked and looked and looked, I remember printing it off the 'net, but for the life of me I cannot find it.
While I think we have, for the most part, sufficient rules, I do think some kind of addendum or appendix which gave non-inclusive examples would be helpful. For example, I would like to see 2 or 3 (different) examples of situations that arise which fall under the generally accepted definition of soft play, this being one of them.
I realize that interpretations may differ from place to place, but one of the reasons for the TDA, as I understand it, is to promote consistency in rule interpretation, at least as much as is allowed by gaming regulatory agencies. Perhaps this can be addressed at the next TDA Summit.
Chet