One of the issues with Resto Shaman in M+ is that damage is incredibly boring. You drop Healing Rain and pretty much spam Chain Lightning. The Totemic capstone is a great opportunity to fix this.
Give each of the three motes a damage component and let us choose whether to consume them for damage or throughput. For example:
Air: Your next Lighting Bolt strikes all targets effected by Flame Shock for x% damage.
Fire: Your next Lava Burst on a target effected by Flame Shock spreads Flame Shock to five nearby targets.
Earth: Your next Chain Lightning casts an Earthquake under the primary target.
This would make damage as Resto so much more fun and interesting.