I would say yes. I would say its what we would class as a normal FOS (pin) but interrupted, for which the standard has many examples, checkout this link http://www.etinews.com/techpaper_FOS_ASME.pps
, for which Alex Krulikowski says the standard needs to give us more definition and clarification on this issue.
The standard defines a FOS as
126.96.36.199 Regular Feature of Size. regular feature of size: one cylindrical
or spherical surface, a circular ele- ment, and a set of two opposed parallel elements or opposed parallel surfaces, each of which is associated with a directly toleranced dimension
Well it is a cylindrical surface and it would have a directly toleranced dimension, so yes its a FOS in my opinion.
Fig 4-30 in the 2009 is the closest to a half pin example i've seen in the standard