First, your RP dump as frost will be Frost Strike.
Second, when you macro Rune Strike onto your abilities, always do like so:
/cast !Rune Strike
Adding the ! makes sure that if rs is already queued to go off, you don't cut the rs off. If you leave the ! out of the macro, it'll queue it up but the next ability you use with rs macro'd on will actually shut it off before you use the attack. I -think- that's how it works.. I activate my rune strikes manually for better control and timing, but that's just my micromanaging mindset. I've been told this is bad, but it's well within my mental and physical abilities to hit the zero key every 2-5 seconds.
...Thoughts of a philosophical Death Knight...
If death is the inevitable end of life, is life the inevitable end of undeath?