I'm afraid your options are very limited. Apart from two Flutes, there are no keyswitches for alternate playing techniques in the entire Woodwind section. 

There just aren't the samples. If you're very experienced with editing sfz files, it might be possible to fake it using the existing sound somehow, but unlikely and difficult.

Thanks,  I expected as much.  I’d love to see a GPO6 with additional articulations. The Garritan samples are second to none in my opinion. I have the BBC “Discover” orchestra, and prefer the Garritan by far.

You may want to think about the Garritan Jazz and Big Band library, which has lots of Woodwind articulations, breath noises, staccato notes, etc.

Also, I've just come across the "Virtual Playing Orchestra", which is a free library that works in ARIA. It's not bad for the money, and the samples work well as complements to GPO -e.g. layering both together. It has staccato Wind samples, so that's something.

It uses different key switches from GPO, but the sfz instrument definitions can be edited.

http://virtualplaying.com/virtual-playing-orchestra/

I used VPO before buying GPO5. Great starting platform, but the GPO samples and dynamics are much better. It is an option for the occasional part though. Other Garritan libraries are a possibility..  I’ll check them out. Thanks for the input... always appreciated.