Seems like this question came up a couple of years ago. Yes, it can be used in the plural. There are quite a few refs on our in house search engine.
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Grammar Geek You would say "The boys all displayed good behaviors" as one hung up his coat, another wiped his feet, and another remembered to say please and thank you.Well - - - I think I'd say they all displayed good behavior.
Grammar GeekYou would say "The boys all displayed good behaviors" as one hung up his coat, another wiped his feet, and another remembered to say please and thank you.Do you mean "you wouldn't say" (i.e. you wouldn't use this jargony word in everyday contexts)?