I know HTML, which you use for the forum formatting is supposed to be a "world language" and all, but did you consider adding more straightforward forum text formatting options like the general "forum code" used in nearly 99% of the forums on the Internet or maybe Markdown used on the Stack Exchange network?
All in all, who is your target market? Web programmers only or people? 
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More people worldwide know HTML than 'forum code' (which 1/2 of sites do one way, 1/2 do the other, switching up the parenthesis and brackets just to be infuriating) or markdown. And HTML is just as easy to use as forum code. I don't know anyone who knows forum code but not HTML.
For the most part, all we want is text anyway. We want people to convey their question/problem/solution without a lot of noise. That's why headings, inline images, tables, etc are all disabled.
Sometimes, the impossible can become possible, if you're awesome!