Sorry for interrupt,
But whatsup with this Green Minded Abuser http://eathena.net/board/topic/53509-rops-control-panel/
and as far as the Control panel is concerned, I would rather suggest something else,
Making modificatiions to some CMS:
Like joomla or anyother open source... such that registration on web updates eA tables too.
Other custom pages will be added so that they interact with eA tables.(pvp ladder,donation page,etc)
I hope you get it.
This will be better as ... you can bridge joomla with other tools too... and this will improve the flexibility to very high extensity.
Joomla is just an example other flexible cms can be taken.