One point in Lava Flows is worthwhile for the range increase, in a leveling build.
You'll want three points by 75th, when Lava Burst becomes trainable.

For a 51-10-0 build, 5 points in Enhancement for the mana pool, 2 points for instant ghost wolf and three points to spend between grounding totems and crit chance.
As you level, you'll likely want to max both of these.

I want Elemental Shields, Lava Flows and Astral Shift maxed in my final 80 build, but don't need all of these in my leveling build.

I suppose you could have a leveling build and then do a total respec at critical points too.
Either approach is valid.