How about adding some of the 1986 movie soundtrack? During the titles, an edited version of Lion's Transformers theme can play, and maybe You've Got the Touch during the final battles. Another song from the soundtrack can possible play thru Bumblebee's radio, if something would fit in there. These changes can also be on an alternate audio track only.

What about replacing Megatron's voice with the voice from the game or old cartoons? Also maybe doing this throughout the movie for the characters that don't speak much?

Can we have Sam and Ron at least once, called Spike and Sparkplug?