I support this idea. The only way it really could be implemented is if it were an automatic thing. Which would make it hard because not everyone's name on the forums are the same as their in game name. It would take a special staff position dedicated to this.
They would likely have to make everyone use their ign name as their forums account. I know several people that like having theirs different and keep their identity a secret. Not sure why, but they do.
Like @Flazey said, There is no addons or an easy way to do this. Plus we would need someone to manage and give everyone their ranks. For now no support.
Donating is meant to help the server, and doing it shows you support and like it. Ranks and commands are just rewards for doing so, simply because you donate means nothing, no special treatment, your just another normal player. No Support.