The lack of a quote button is intentional. Two main reasons for that… First, I have seen that most forums that have this feature often have a lot of redundant junk in their threads from someone quoting 5 paragraphs and adding a line or two of their own. That’s very annoying and makes the thread hard to read.
Second, quoting is often used by posters who want to dissect another member’s post line-by-line and refute each point. We do not want to encourage such posts, as they tend to become one-on-one debates that add little to the community.