[Naiya]

not entirely sure I understand your question, but I will try to give what answer I can. This answer is generic because I do not have a DK nor do I PvP - sorry I can't be of more help, but here is what I know

you can only have one action per macro, so you can't put in multiple attacks or what not

you *can* however, make a macro that will use your chain ability once it's triggered (make a macro and put /reactionautochain and that will execute your chain ability)

hope that helps in some small manner