Allow users to change/override order of operations
AE does its operations in a specific order - eg: first it looks at transforms, then masks, then effects, etc. (I can't recall the exact order and couldn't find it online).
Sometimes you need to extensively precomp or re-think how you're building something in order for it to work properly. This can be a huge pain and can cause a bunch of extra work.
Instead of that, could there be an effect that you could apply to a layer that would allow you to re-order those operations? Call it "Re-Order Render Operations" or something.