While I like Kizzik's idea about being able to use different wield for different classes I think (and I'm sure I've read this before somewhere) that specific classes have specific weapons so they are identifiable...particularly for PvP.
Ugh, I hate that! I really think that a larger variety of weapons should be selectable for the different classes, PvP be damned! After all, its not like when you are in the craziness of PvP, you are really that concerned with the spec of who you are fighting. At least when I am playing, I am trying to stay alive and complete the objectives, not whether I am throwing rocks at Operative or a sniper.
I think multiple options makes sense in the lore too. For Troopers, the currently most recognizable trooper in star wars is that Clone Trooper, Commander Rex. (Honestly, I can't really think of any other Troopers characters.) And he is famous for?
Dual wielding blasters. That is his shtick (at least as far as I have seen. Don't watch the tv show that much). Not to mention, there are a bunch of mobs who have guys with vibroblades. Why can't troopers, bounty hunters or smugglers equip and use them too? (Agents can, but used for a limited number of abilities) The vibroweapons would probably require a major overhaul of the abilities available to each class, but just saying.
Also, I wish Jedi Shadows could choose between single or double bladed. From my understanding, the Shadow's abilities don't work with a single blade lightsaber and honestly, the 'Obi-wan' experience doesn't fit Obi-Wan. I think if he was a character in TOR, he would be a Shadow with a single bladed lightsaber (he sneaks around a lot, not use a bunch of force powers).