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Modifying comments_template() worked fine. Didn’t try to test it only on $withcomments as this would be in fact more discriminating: (A OR B OR C) is less discriminating than (C). Anyway, “if (true)” worked like a charm on the test, thank you very much for your help ??

In case anyone still matters about this, I’ve come to a different approach that both reserves some nicknames for exclusive admin usage and visually differentiates admin comments from those from the visitors/users.
It is explained in spanish on my website, but it shall be easily understandable by english speakers. If it’s not and there’s enough interest on the subject, I’ll translate it to english.

solano: “This is the definition of a hack!” Hehe, true… still…. ;D
On user registration, I didn’t mean to require registration to post, but to post using a name. Anonymous users (those not registered) can still post whatever they want, but are not allowed to post using a name and thus they can’t impersonate other visitors. Not to say they can’t post using the author’s name!
I hope this clarifies my point ??

I think (and I might be deadly wrong, but willing to be enlightened!) that using the same authentication procedure for the comments on a blog that is used for this miniBB based forum would be quite usefull.
As Solano said it takes a real loser to pose as the author of a blog, but without comment approval it could happen and it makes you look damn stupid. IMHO, allowing anonymous comments shouldn’t be opposed to allow regular visitors or the author itself a minimum anti-spoofing guarantee. Once you can authenticate the author of a comment, you can apply whatever user specific hack or plugin you wish. Of course this would need a user registration feature, something that seems a little offsore for most of the blogs for no known reason to me.
As said, I might be deadly wrong…