Actually, if you look at the rules, there is nothing in there prohibiting "2nd Unit" or "Additional" crew credits.  For whatever reason (good or bad, not juding their reasons) there is a belief held by some that these people should not be included and they present this personal opinion as if it's part of the rules here in the forums.

The credits section is very specific about which "Unit" crew members not to include (this being the Cinematography section) and also specifically says not to include any "Co-", "Associate", "Assistant", or "Intern" credits in some of the other sections (Director, Produciton, and Sound).

Other than that, there is nothing rule specific stopping you from entering 2nd Unit or Additional crew credits.  I don't know what profile this is since it's not in my list but I would probably vote No on it as well.

Quoting Italo Disco:

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However, for directors the contribution rules clearly state: "Do not include Unit Directors or Directors of Special Features".  There's no such statement for other "unit" cast members though...

Right. Personally, I've always reasoned that if we're not to include unit directors and unit cinematographers, then why would I add a unit production sound mixer, or a location art director? That distinction never made much sense to me, especially since both any unit directors or unint photographers usually get more "prominent" credits than other unit crew. Therefore I tend to leave all unit crew out altogether - since we can't enter them all, then I'd rather leave them all out, and I do believe this is the intent of the rules.

Other parts of the rules also confirm this: for instance, look at editing. When a film lists a "film editor" in both the opening and closing credits, we're to use the one from the opening credits ONLY ("Principal Editors listed when credited together"). So we are to disregard any further editing credits, even if they're flat-out credited with "film editor". I tend to extend that practice to other roles, like unit art directors and unit production sound mixers. If the top of the end credits list a "general" art director, and then a "unit" art director somewhere deep, deep down in the credits, then I'd only enter the "general" one, from the top of the credits list. Again, I feel this is in line with how we deal with other parts of the crew, like the rule on editors, or the fact that we're not allowed to include unit directors or unit cinematographers.

Quoting RHo:

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Except for the case that "additional music" may be worth a song writer credit, all other additional anything should not be listed IMO.

Sounds spot on to me