I think it would be cool if clan leaders could assign taxes/member fees to their members. This is something that exist in the towny plugin and it adds some cool dynamics. This makes it possible to fiance clan business and also makes people pay for their membership.

I think it should be a max amount that should be made in the config so that people can not scam their members by stealing all their money in one day. In towny taxes are collected at noon every day (real days, not in minecraft), this could be cool to do here as well.

With valult it should be "fairly" easy to make it compatible with several economy plugins. I would also appreciate if it was possible to make the clan account in the dedicated economy plugin (like craftconomy), so that its possible to make clan "chestshops". I would picture the format of the account name to be "clan.TAG".

maybe also make it possible to add upkeep to the clan. So that you pay a certain amount every day to keep the clan. maybe even make it possible categorize clans into size. For instance a clan with 1-10 members pay 10 coins, a clan with 10-20 pay 30 and so on.

I also think it would be nice if half of the cost of the clan home goes to the clan. So if "clan home" cost 10 coins. The clan will revive 5 coins for every teleport.