That's not quite what I meant - you can certainly change people's quoted posts to e.g. bold, italic, and red, as I've just done with yours! But try to delete nested posts, and it's a different matter (before, you just deleted anything between a
or even just bits of it). E.g., I can't see how to remove my nested quote here, and just leave yours.
ETA: Interesting - putting {quote} and {/quote} - but using square brackets - has generated an empty quote box! ... or this? I've just pruned your nested quote.