Multirotors "Reach Altitude Before Moving to next waypoint."

[GenCodeInc]

As more support is added for multirotors can we add a "Reach Altitude Before Moving to next waypoint." checkbox on any WP.
That it won't proceed to next wp until it reaches so my WP1 at starting location will go up to desired altitude on WP1 before WP2 starts.

For now, I handle this by making WP1 be a PH_TIME for 15 seconds which allows it to get to altitude, but it's not really the ideal way as sometimes it reaches first then sits there for the remaining seconds.