Ok added some macros.
I did some adjustments to the one you posted.
Added an error message blocking code to it.
#showtooltip <Ability and rank>
/cast <Ability and rank>
/cast !Rune Strike
The '!' before RS prevent the macro from toggling off the RS once it has been activated, if you are spamming the button.
Also made one for Death Grip and Dark Command
Of course what ever modifier you choose.
/cast [nomod] Death Grip
/cast [mod:SHIFT] Dark Command