NFL level they are typically only used for kicking. College and Highschool level you may have a dual threat kicker. We had a pair of twins in my grade: one was a kicker and a running back while the other was the quarterback and a running back (when he wasn't playing QB). Typically they were used for kick returns.
Only reason they didn't get much into college ball was because they were shorter than average for their respective positions besides runningback at 5'7" each.
Anyway, so this was all a publicity stunt? Shamefur dispray, that is.