I don't know if the writers would have brought back many people for a recurring role on occasion back then, but if was done today,maybe with all the instant feedback on the Internet, they might have.
I felt a cheaper, easier way was just to mention them in passing at times. "Albert, Willie and Graham were fishing", "Someone was looking at Widow Thurmon's old house since she moved back to the city", things like that.
The emphasis was on the Ingall's family though, it was a credit to the writers that we got attached to some costars and guest stars.