I've started rearranging the actors' roles into alphabetical order. This would make things a lot more organized on actor pages who have a lot of roles. This could also be something else for you to do on such pages if you wanted.
Good idea, not a bad one, but I actually agree with Ngh93. By the way, you forgot one thing: If any actor/actress has more than one role in the same film and/or television series, only the first one in the gallery should be linked.
This is mostly for actor pages who have a huge number of roles like Jim Cummings and Frank Welker. Jim did 400 roles while Frank did 200. Try finding a specific role among hundreds of disorganised roles.