Lightsaber colour crystal bonuses.
Can the colour crystal carry a bonus/restriction without changing the lightsaber? For example, the Mantle of the Force changes things for all crystals added to it. What I'm wondering is, can a unique saber (such as any in a saber mod) have a normal colour crystal placed in it, and not have a change in model? And can that colour crystal have a restriction/bonus (restricted to user, usable by X)?
It is better to have it and not need it than to need it and not have it.