Personally I think it'd be a good idea for a Discord server, however, wouldn't that take discussions away from the forums? People nowadays expect (or at least want) immediate responses which is fine, but usually instant messaging platforms take away the need for discussions on boards which is a shame.
As for the forums; it would be nice to see perhaps a different color pick for member groups. Not too sure purple for members (or a purple-colored group) quite suits the forum style. Especially pink for moderators. Although it's my own personal opinion and it may differ from others' but pink on this style theme is hideous and difficult on the eyes.