If they ever do an uber-mega deluxe edition, they should CGI some points on his ears.
It's a cool idea, but it contradicts the information provided in the Voyager episode "Flashback." Tuvok's initial Starfleet posting was aboard the Excelsior. There's no mention of his serving aboard the Enterprise, and as less than a year had passed since the events of The Undiscovered Country, he would almost certainly have been on Excelsior during Generations. He certainly could have been playing another Vulcan character, however. Perhaps Tuvok has a long-lost identical twin.
--Sran