I can't really think of anyone better to write and direct a film about Sal Mineo. Franco has always struck me as a James Dean-esque actor (who, incidentally, has already played Dean--and quite well, at that). As a "serious" actor himself, I imagine that he'd do a good job depicting both Mineo's personal and professional life with the right awareness of how, for an actor like Mineo, those two aspects of his life overlap and intertwine.
With regards to Mineo's sexuality, most writers/directors would either downplay it or would over-emphasize and sensationalize it. Franco, on the other hand, has experience playing gay men in biographical films (Scott Smith in Milk and famously gay poet Allen Ginsburg in the upcoming Howl). He has also directed gay-themed student films.
I imagine Franco would create a story that has the right amount of sensitivity and respect toward's its subject without shying away from Mineo's sexuality or his personal struggles.
But maybe that little crush I have on Franco has biased me.:smile: