Lightsabers may be powerful: But in an obligation based system it's highly detrimental to carry one in the same way it should be determinal to weild a heavy autofire weapon openly. Personally not all weapons were created equal; weapons with autofire are heavy anti-personal weapons that is fully capable of clearing out a room in terms of the heaviest weapons. Thus it is up to the DM to engineer situations where those weapons are restricted in use. Wacking a bounty on them for excessive use is well within the rights of the DM: Though as a plot elment a lightsaber should be treasured as a oppertunity up to the point it's being abused.
That being said; I have had much more problems with autofire weapons then I have lightsabers. I find them discusting weapons that make combat trival for everyone involved.