Ever since the first clan was made, people have been wonder & asking, "What are clans for?". Well, besides the personal stuff that the clan leaders provide for their members like cityhouses & a longer name because of the <xyz> in front, why not let the clan leaders request special features for their clans?
Suggestions:
1) Depending on the founder's DK count, he/she may go to Hinata at the clan hall & get his/her clan a clan special for a price. Example: All <SOS> members gets devine protection from Suzumiya Haruhi (Buff, defend +50% for 30 rounds). This might roll out those acedemy student & genin clans.
2) The clan members are allow to borrow more money from the bank under the name of the clan & the founder will have to pay for the debts. This is to stop clans from having too many members or just taking in any clanless players they could find.
3) Made a module that actually allow the founders to make real alliances. Once an alliance is formed, members from both clan will not be able to PVP each other. And if two clan becomes hostile, their clan members will be allowed to PVP members of the other clan without orochimaru kill or level restrictions. That way the clan leaders will keep a better eye on their members so that they don't go around making enemies for their clans.