Right, this is far more interesting than whining about the final boss.
When you are about to enter the final room go in carrying the concusion rifle instead of the sabre (I was using double ended and playing dark side) when the cut scene ends you are left with what I have dubbed the 'Concusion Sabre'.
My double ended sabre is stuck on the end of the gun like a propellor, I have tried it twice from the same save game and it worked both times. I can't tell if the range or damage are changed, but the character uses it like a club.
This could quite possibly be very old news in which case I appologise.
I have a screen shot of it and save games if any one wants me to email it to them, apparently I can't post attatchments here.