Well, I'm not going to beat Greg up on this one at all, in fact I would have done the same thing. I even had to resort to a few "no-no's" in my own panel at home. Here's my situation:
200 Amp GE panel fit between two studs in a finished basement wall. House is total electric, so there are plenty of large cables entering it, all from the top, and all knockouts are well-used. Due to the studs, there's no way to enter from the sides (I don't like doing that anyway). The only way to bring any other cables into the panel is from the bottom. Being a finished basement, this isn't really much of an option either. Personally, I prefer that ALL cables enter from one end or the other, never both and never on the sides. That's just my preference. I also prefer to use butt splices instead of wire nuts to extend wires that are short.
The only knockout left in the top was a concentric one in the center that goes up to 2.5". I had two 6/3 romex cables to bring into the panel, one for a sub panel in my shed and another for a second range in the basement. I ended up putting a 2" Romex/SEU connector in and brought both 6/3's in through it. They fit perfectly, of course, but there's no doubt that some gun-slinging home inspector will eat me up on that one if I ever sell the house.
My take on this is that sometimes, you have no choice in doing it 100% correctly, but 90% correct is close enough. It's not like there's no connector at all; it doesn't mash the cables excessively and it holds them well. Am I going to home inspector jail?
