Watch The Amazing Spider-Man, they handle the abilities fine. And in the comics he developed the knowledge of how to make the artificial webbing after being bitten.
tendo, you do realize Cameron wrote The Terminator, Rambo: First Blood Part II, Aliens, The Abyss, Terminator 2: Judgment Day, True Lies, Titanic, and Avatar? So he is a very prolific screen writer. Most writers do not have the talent to direct a film (and vice-versa, many directors do not have the talent to write).