Playing around a bit...
Haven't really played around with this enough... might have to adjust the Reset to Step 1, for reapplication of Earth Shield.
Not sure if six seconds of Riptide, Healing Wave, Cleanse, Chain Heal... out of every 12 seconds is enough healing; could adjust that to be longer or possibly put additional Healing Wave or whatever into that castsequence.
The Lightning Bolt is a filler... do some DPS and restore some mana, until more heals are needed.
Riptide never falls.



Edited the FTL DPS 1 Key.
For everyone else, it is:

Hotkey: 1

Step 1
- Do FTL Assist Me > Current Window
- Send "1" to Elemental Shaman
- Send "1" to Feral Druid
Step 2
- Do FTL Assist Me > Current Window
- Send "2" to Elemental Shaman
- Send "2" to Feral Druid



For the Resto Shaman, it is:

Hotkey: 1
Reset to Step 1 (48.0) seconds, after the FIRST press

Step 1
Do Not Advance to next step for at least 2.0 seconds.
- Send "1" to Resto Shaman
Step 2
Do Not Advance to next step for at least 6.0 seconds.
- Send "2" to Resto Shaman
Step 3
Do Not Advance to next step for at least 6.0 seconds.
- Send "3" to Resto Shaman
Step 4
- Keymap Actions > New Mapped Key Step Action > Reset to Step 2.



Resto, on 1:
#showtooltip Earth Shield
/castsequence [@focus] Earth Shield, Water Shield
/script UIErrorsFrame:Clear()

Resto, on 2:
#showtooltip
/castsequence [@focus] reset=5 Riptide, Healing Wave, Cleanse Spirit, Chain Heal
/script UIErrorsFrame:Clear()

Resto, on 3:
Lightning Bolt (straight out from the Spellbook).
[She has Telluric Currents trained, and regains mana from casting Lightning Bolts; Resto mana lasts longer than Elemental mana]