It would be interesting if you could buy or have made available a different transporter effect than the one that it currently used. Since the current one is pretty much the Voyager theme, there could be others such as TOS, TNG, TNG Film etc.
Simply no. I wouldn't throw my money at Cryptic for something unnecessary as a different transporter effect.
That's a fair comment... however there are certainly people who WOULD pay for exactly that kind of aesthetic bonus, which, according to Cryptic, is the exact point of the C-Store... items that change to players experience without changing the content.
If it is possible I think this would be a great addition to the C-Store and a good way for cryptic to legitimately earn some extra money from die-hard fans... without penalising the people who are just here to enjoy the scenery