I tried adding a link in a Introduction thread, but was informed that I need a minimum of 5 posts to be able to post a link.

Is this to defeat spammer? If it is, then it won't work. Spammer can just randomly post up to 5 "spam" posts, and then proceed to spam the whole forum with "spam" links...

Admin, please go check the Introduction section, how many new threads with 0 replies in them? How are new members supposed to really introduce themselves without being able to post a link to their blog or site? This forum is not friendster or myspace, are we supposed to post all our photos and our interest and full profile in the Introduction section and only then expect people to reply to our thread?

Well, I don't want to be too critical yet for I do not know the real reason behind this ruling, hope to receive a decent explanation soon....