There haven't been any updates to any of the Garritan libraries for several years, AFAIK. GPO similarly has several issues: risible ranges of the choirs; errors in the instrument definitions; incorrect loop points, etc.
The good thing about the SFZ format is that it is easy (comparatively) to edit the instrument definitions, correcting problems and modifying the instrument definitions. You can create new instruments, change key switches, trigger criteria, etc, etc.
I was referring to Note Performer 3 - specifically that the spacing of unarticulated notes is almost staccato. I exchanged emails with Wallander tech support (which was great by the way) and they confirmed that "The interpretation of NotePerformer is very classical in nature." and that there were no other interpretation modes or settings to alter it.