With segmentation baked into SC15 it is tempting to use that functionality to have multiple sites in the same report suite. However certian metrics and data points do not fit well into this model such as exit and entry points, referrals, referrer type etc.
It would be useful if we had a seperate variable called s.site, when a segment is created using the s.site varaible all the data points are treated as a single site. When s.site is not included in a segment the entire report suite is treated as a single site. This would give the client extremely powerful options on how to configure multi-site approaches using SiteCatalyst.