I also hot-keyed death coil so that I spam DC when the macro is on cool down. Overall besides the fact that only BS parries may screw up your rotation from time to time (if zero parry you will have a 6.5% chance of the macro failing) this setup brings you on most cases an optimum rotation with less effort.
I placed howling blast on the end so that it will have a much better chance of getting a rime proc.
From my previous list of desecration usefulness I can add that on malygos it is useless but useful on satharion.
so overall its a free 5% damage bonus that shouldn't be missed up.