I'm sorry, but I've never seen such feature on forums and it doesn't add anything imo, at least in the current form.
If there's an important reason for it, I'd suggest better implementation, like making it more visible, maybe similar to this, centered and little clearer than generic text. Generally text tools seems to be all over the place, at least in my browser: Align and other formating tools affect whole post, not just the selected areas.
It's a forum, I'm quite ready to read blocks of text and I don't expect them to be cut so randomly like now.
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