I'd say--as a limitation--that it can only be powered down once a round. If you power the 'saber down and then attack, you can't power it back up until your turn in the initiative cycle comes up again.
Probably changes the complete damage die to d6s. I don't know, that's all I can think of at the moment. That at you can't crit someone to death right off the bat or close to the beginning of the fight.
Yes. I said mew. It's a plaintive noise, intended to evoke a sympathetic reaction. Probably works better in a more auditory type of setting.
As for who I am, I admit I haven't exactly been a Posting King here, but there hasn't been a lot for my character to add. She's patiently (sorta) waiting people to work things out so we can go on the mission and do stuff. I'm not criticizing, but I wasn't expecting quite so much...debate...when I conceptualized the character.
Anyway, I'll try to do better; and if I can't I'll drop. In the meantime, I apologize if my posting rate hath offended.