Can gliders and powered aircraft co-exist on the same runway?

I can think of two examples from my own personal experience:
1. Terry Airport (TYQ)- north side of Indianapolis, former home of the
Central Indiana Soaring Society, usually had right hand traffic for
gliders, which frequently used the parallel grass but would also use
the pavement. They are not there anymore because of big increase in jet
traffic at that airport.

2. Harnett County, North Carolina. Home of North Carolina Soaring
Assoc. much less busy airport, staged off the pavement for launching,
but would also use the grass to the side (not a formal strip) to land.
More traffic was overhead with the proximity to Fort Bragg and Pope
AFB. Also used right hand traffic for gliders.

-Ryan