1. a chat box on the forums rather than the one at the bottom of the screen. the XAT one isn't very good in my opinion. this would mean that you would talk with your forums account encouraging more people to use the forums on a more regular basis.
2. More categories would be great. Ones that would allow people to put them in more specific spots. examples: suggestions, market, rules. possibly categorize them according to what they relate too and have sub topics under there. runescape then have categories under that to select from.(would be willing to talk to someone about this if they don't understand in more detail.)
3. use the update section of the forums. as of now there is nothing under it.(should only be allowed to be posted on by owners/admins that know exactly what the updates.) updated players are happy players.
(Will update when I can think of more)
Feel free to post any comments or ideas you may have that you would like me to add to the list. (this is not for ingame suggestions(stay on topic please and thank you.))