If I could have an acting role in a movie, I should like to be Q in a James Bond adventure.
This should make you laugh, because I am the farthest thing from a tech geek you can imagine! But the original Q was too, apparently.
It would be fun to tease Bond with tech wizardry, seduce him with the sexiness of it (oh, and that Aston Martin!!) and also save his ass with it. A good role in which you appear briefly, but can be many things waiting to be discovered and developed. Q had a secret life, made secret things and was probably a loner like me. He was the one you could never doubt his loyalty to Bond, MI5 and country.
What could be better than that?
And, it would be tremendous fun!