I'm not sure how realistic this is, but it would be awesome if you could highlight exactly what text you want to quote on someone's post. Then when you press the "Reply With Quote" button, only the text that you highlighted appears in the quote.

This would be especially useful when someone posts a paragraph of explanation as well as a wealth of code, but you only want to comment on a piece of his or her code.

I realize that you can delete whatever you don't want to include in the quote (and add things as well ), so this is just a convenience issue.