I was a member of SUAS for two years and loved every minute of it, the flying was probably better than anything I'll ever get to do on the Civillian side!
I'll have to get back into gliding if I can find the cash, like you say its good for the basic 'stick and rudder' skills. Trouble is its expensive and the club is so busy (for the number of gliders) that learning is massivly disjointed with only maybe 10 or 20 minutes of time in the air per week/fortnight. So that shoots the cost of aquiring the skills right up.
I've spoken to the people at GAPAN and they seemed to be mostly interested in plugging the apptitude tests (which I'd also do if i had the cash!) but never heard anything about PPL scholarships?
Could anyone expand or give me some contact details?