Okay, I'm going to start by addressing "Uke Assistance". I really only think it's a bad thing if you actually move Uke's joints. But if you say, break off his arm, catch it, and use his arm to break off his hip or decap him...SICKNESS! More power to you. That's tough to do! Even using his body parts to gain momentum is acceptable in my book, because you're still only using what you have at your immediate disposal, the tools you have, or the tools you've made for yourself.
And as for madmans...I figure madmans should be at least 4 or 5 dms. But I always defined madmans by STYLE, rather than number of dismemberments. Instead of using strikes and strategic grabs and such, madmans, to me, were always more about wild grasping and animalistic ripping and tearing to make a brutal scene with lots of damage, regardless of how many limbs come off.