[zmmmmm]

ok - replying to myself - defining a function to overlay the normal pass command can work around it like this:

    function pass() {                                           
        defaults write org.p0deje.Maccy ignoreEvents true ;
        sleep 1;
        /opt/local/bin/pass -c "$@" ;
        echo "Copied password to clipboard for $*";
        sleep 1;
        defaults write org.p0deje.Maccy ignoreEvents false;
    }

I think this might work ok!