This is more the mod's problem, because the problem lies into the saberentity memory problem... If anyone is attempting to sabersteal anyone who s playin from spectator mode, the mod practicaly "forgets" to give back the saber to the spectated client.
Some rumors came from tox, from uL clan that you could manage to kill ppl from spectator mode with that but i never had experienced in real, nor anyone else did. Let me tell you one thing, all what you could do is to force that guy who spects you to join or block the spectator mode or fix the code. There is already a fix for it, but you can only do it if you use an other mod.