theymos customized the forum a lot from initial source code of SMF software to add more customized features for Bitcointalk users but more important, to secure the forum software more.
Because the forum software is considered as very secured now, any change will need to be considered very carefully.
None of these ideas are new to me. Even if I don't respond to suggestions, I do read them, and they float around in my mind going forward. If it's not already done, then there's some reason why. A big possible reason is that I'm the only person who does development on the current code, and my time is limited. Another big reason is that this is a huge forum with complex dynamics, and even small policy changes can have big effects which need to be thought through very carefully.