Sorry, late to this discussion. We are about to use the Staff OBS to differentiate demand for the same role from different parts of the organisation. It is critical to ensure that we keep down the number of roles we have to manage. For example, I need a Business Analyst, but from which resource pool am I going to source that BA from.
The second way that we have used the Staff OBS is as per what Kristin_Schroer identified earlier to differentiate rates in the Rate Matrix. This has allowed us to have a standard rate by location and in addition differentiate a higher forecasting rate for an open role.
Meeting these two demands has been difficult, because the Staff OBS can be used to identify only one OBS hierarchy, but the hierarchies are not necessarily the same in the two requirements listed above.
Recently the Australian based User Group has been actively discussing the need for the Staff OBS in the new UX with representatives from CA. We are intending to vote in unison towards a goal to push Staff OBS into the mix for new functionality in 15.x