[stavros]

I don't know how passenger gliders are designed, but if they're anything like well-designed RC planes, they'll stall by dropping the nose, cruise with a slight up pitch, and have a tendency to right the wings.

That does make a craft very stable in flight, to the point where some RC craft I've used land themselves (albeit a bit hard) when they lose power.

[kirrent]

Pretty much yes. Trim to your desired speed in level flight and you can go hands free. Large fins mean strong yaw stability, long wings mean strong roll damping, dihedral on those long wings is relatively large as well so you're stable in level flight. Nearly all gliders are very well behaved in stall and mush forwards without being likely to drop a wing.

As far as pitch, elevators tend to be close to neutral or produce negative lift. There's generally not a noticeable pitch on the aircraft simply because you want the fuselage as closely aligned to the airflow as possible to reduce drag.