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Mr. T - probably not so good. I can't really imagine him playing anything outside of a Mr. T-type of a character. Maybe he could have played himself in somebody's holodeck program.

Peppard would have done real well in one of those episodes where there's some old captain or admiral who lost his marbles or something. I could see him yelling at Picard or setting himself up as the ruler over some indigenous species on a planet.

Benedict could probably have played a role as an officer temporarily aboard the Enterprise who has a terrible secret he's running from and gets himself killed at the end of the story. Maybe he could have played some kind of space pirate or alien of some kind as well.

George Peppard would play an easy going cigar chomping Admiral and play cards with the officers, much to Picard's dismay, Mr. T would guest star as a scene stealing Klingon with bad attitude & bling much to Picard's dismay, whilst Dirk Benedict would romance Doctor Beverly Crusher - much to Picard's dismay!