GPGnet had a decent clan system,you could create.leave/join Promote members demote members, things like that. Most people would see that as a step above a basic here is my clan, join it or leave it.
Other then recording stats you don't say much to what you have in mind. You want stats of how many wins/losses the Clan(and every member in it) has as a whole or do you want stats like TimmyFred hasn't logged off in 32 hours.
You gotta be specific, I'm sure a general suggestion might spark some ideas for the dev team but Specific requests go alot further, they can easily identify whats plausible and whats not, or what might be a viable post release patch option.
Things like stats clan stats tracking(was useless in supcom - good job DI you can recruit children, Maybe you can take back a small African country) The point is make suggestions. Say "I would like my clan to be able to issue challenges to other clans because Demigod is going to be a Team based action RPG/RTS" or "I like that thing you did with GPGnet where I don't have to wear a clan tag but it appears beside me so I don't look like a _CZAR douche"
My suggestion is Have a ladder, but make it like an Automatch search-Only your clan members can join your team and have it match you with other teams. Depending on the community size though it could be a total flop.
And yes I'm an angry person!