Wouldn't it be a better idea to use HKN toggles or swapactionbar to deal with mend/rez pet? Sticking it in a cast sequence, while currently effective, is not the most elegant way to deal with things like that.

There should be a link to using toggles in either the bottom of my HKN guide or in the tutorial links of my newb boxers guide (in my sig...on a phone so I can't check). This way you can use a macro for /cast [nopet] rez pet; [pet] mend pet or whatever in the toggle and not risk lockups on dps.