JJ2+ already supports unlimited episodes. They're currently all displayed on one page and I'm not sure we have a desire to change that. We might introduce some layout changes if level designers begin using episode files enough to warrant them. Currently very few downloads contain episode files.

If your use case is fast access, instead of going out of your way to create custom episode files for every level you like, which sounds like a lot of effort, you might want to consider adding levels to favorites in the Home Cooked Levels menu - that's what that feature is for. Levels added to favorites will appear at the top of the list.