I used to use a number of these 0,1,2,3 etc. macros and think I have a work around following the changes of patch 6.0
I think the best way of illustrating is an example. This was a couple of lines from a simple macro I used on my BM hunter:
/castsequence reset=0.3 0,focus fire
/cast kill command
Nothing too complicated, just meant that standard use of the button would activate Kill Command and I could spam it to active Focus Fire. Used to work a treat.
I tried updating my macro as has been suggested by simply removing the 0, and increasing the reset to 0.8 but found this did not work. The macro got stuck at the first line.
What worked for me was removing the 0,1,2,3 etc and ordering the macro the other way around. So my new macro became:
/cast kill command
/castsequence reset=0.8 focus fire
Not sure why reordering the lines of the macro the other way around should logica lly make any difference, I can only report that it did for me.