You can check to reset to step one after:
- "x" seconds from first press
- "x" seconds from most recent press

Depending what you want, will determine the best option.
Theoretically with a four step, we get:

Scourge Strike, Summon Gargoyle, Death Coil, Blood Fury, Dark Transformation, Dark Transformation, Dark Transformation, Unholy Frenzy, Festering Strike...
Something similar to that, unless some of those are off of the GCD.

The spam speed determines a lot too.
As well as what is on cooldown and cannot cast because of the cooldown, GCD or lack of runes.

For a DPS sequence, possibly add (check the option).
Reset to Step 1, "5" seconds after the most recent press.