A question came up over at the Dynamo forums regarding obtaining baluster counts with Dynamo.
Well, Revit can’t do this on it’s own or through the API. But, Dynamo can.
Luckily we can extract solids and get the directionality of those solids.(Note: this doesn't work for wacky geometry balusters at this time)

There’s another addition to the list of things Revit can’t do. (On it’s own)

Enjoy.
-JohnP