I´m so confused resto pvp

Do i press lava burst for increased healing
Or do i press lighting bolt for increased healing

Is this a PvP thing? Cause as far as I am aware lightning bolt does nothing other than damage.

So if I had to guess, Lava Burst for increased healing.

New storm conduit pvp talent

Restoration (Restoration Shaman)
Casting Lightning Bolt or Chain Lightning reduces the cooldown of Astral Shift, Gust of Wind, Wind Shear, and Nature Totems by 3.0 sec.

Interrupt duration reduced by 1950% on Lightning Bolt and Chain Lightning casts.

Why cant we have nice things like this in PvE ?