[Dakota]

I agree the ASA instruction is to not use nonapproved umpire-to-umpire signals. I think you hit near the reason earlier (although I disagree with your general condemnation of the larger population of ASA umpires... sure there are some in that category, but the generalization is offensive more than helpful... but, nevermind, that is off point). The kind of signals used by the infamous poster to whom SRW referred is perhaps what ASA is trying to put a stop to.

Personally, I find the BU's D3K signal helpful. I think ASA should include it in their "approved" list. The only argument I can think of against it is that it definitely can signal to an observant coach that the BU disagrees with the PU's call, and if it is the BU that is wrong, trouble ensues.