Thinking about JIRA Epic & User Story hierachy

The original problem that I have in JIRA.

JIRA & GreenHopper plug in are very great. But unfortunately. It just support 3 level depth like below.

Epic_1234: User Administration User_Story_0100: Users can self-register Task_8001: Create new page with registration form Task_8002: Create user class to support all required data Task_8003: Create methods to collect user data and insert into database Task_8004: Create database schema to support user details

Epic > Story > SubTask.

In my experience. major feature for service are around 20~40. And in big project it can be more bigger. But JIRA green hopper Epic space is not enough to display whole things.

Idle requirement management way is

Here is very interesting article – http://q1systems.com/?p=418

They are using hierarchy Feature Category > Feature > User Story

But because of JIRA product restriction, these depth can not be supported in product.

Another workaround, I can imagine is use Excel together. Here is another plug in that I can use unlimited hierarchy in JIRA – http://almworks.com/structure/overview.html but in that case I cannot use GreenHopper.