I don't think single, double or staff sabers should be role-specific. I basically want it to be like KotOR where there are advantages and disadvantages to using each.
Personally I want to use a single saber for basically any Jedi/Sith class I play. The way it sounds right now, you are not forced to use a certain kind of saber, but you won't be very good if you aren't using the one/s that is meant for that class (double sabers for Jedi Sentinel for example). I think this should be changed so depending on what talents you choose you can be effective with any kind of saber.