Within IS Boxer Toolkit, create a Key Map.
Drag it onto your character set, so it will apply to your team.
I like to have a Keymap for a given team, but you could just put things in General if you prefer.

If you create a new Key Map, be sure to edit the Control Mapped Key, which toggles Key Maps on and off.
Have it enable/disable your new Key Map, for the team that it is associated with (not for all windows/all teams).



Create a new Mapped Key, within the Keymap of choice.
I would give it the same Keybind as you use for the Thunderstorm ability in Warcraft.
You can repeat the process with your Totem Stomp macro too.

Give it as many Steps as there are members on your team who have the given ability.
If you're running four Shammies with a Paladin, then you will have four Steps.

Since Totem dropping and Thunderstorm do not require targeting, this is rather easy.
If you were doing Hex on round-robin, you would want to include an FTL Assist Me, in each step.

Step 1.
- Send your Warcraft Keybind, to Shaman 1.

Step 2.
- Send your Warcraft Keybind to Shaman 2.

Step 3.
- Send your Warcraft Keybind to Shaman 3.

Step 4.
- Send your Warcraft Keybind to Shaman 4.

That is basically it.
Your warcraft keybinds are all the same, so you could one-box any of the shammies just fine.
And if you launch the team with IS Boxer, you already know the keybind for Thunderstorm/Totems.
Just press it four times in sequence, once per Shaman.