Alexander Wright is another Cowboy from further back that fits that mold. Supposedly, he had 4.19 speed (which I very much doubt). Never saw him play, but from what I read; he could fly. And.... that was pretty much it.
He was even in Madden 3-5 years ago. He had something like 92/93 speed. :[ Just goes to show you how overrated the 40 is.
He might be worth a look at in training camp and he is like 6 foot 5 I think. I don't think he'd have much of an impact though. He would have to get used to taking hits and he would have to learn how to run routes if he wanted to be a receiver. He'd be one interesting project that would probably cost a lot of money so only a select few might make the move. Washington and Dallas for example.