[kh99]

Someone else might have a better solution, but what I did was define a "clear" bbcode like this:

<div style="clear: both;"></div>

Then if you're done with text that you want to wrap you can insert [clear][/clear]. I suppose you could also edit the postbit or postbit_legacy to insert <div style="clear: both;"></div> (or add that style to an existing div) to make sure the postbit doesn't wrap.