Aaron Sorkin -- I'd LOVE to Write New 'Indiana Jones' ... BUT

If Steven Spielberg wants Chris Pratt to play a version of "Indiana Jones" who can talk someone's ear off in the rumored new movie ... then one legendary writer says he'd love to help.

Aaron Sorkin was heading out of the Montage Saturday night in Bev Hills when he told our photog he's always wanted to write an action flick ... so if Spielberg and co. came knocking, he'd be down.

There's a fear though. Check out the video and hear it from Sorkin himself.