If you want to stagger totems in game, then you need each on their own keybind.
Set Alt Q, Alt W, Alt E, Alt R and Alt T, as the keybinds for the drop four totems thing, for the shammies.

Then while holding Alt, press each hotkey in sequence.
Or set to whatever hotkeys you prefer.

The commas in castsequences are gone, so we cannot stagger them in a macro anymore.



Just about every software for boxing has the option of a round-robin effect.
I'd go with this approach.

In IS Boxer, we create a Step per Shammy (or DK with Deathgrip, Priest with Psychic Scream, etc).
Step 1, sends you Totem Stomp hotkey, to Shammy A.
Step 2, sends your Totem Stomp hotkey to shammy B.
Etc.