1.8 Manifest - how to use "suggests" with plugin order

I've used the "suggests" feature of the new 1.8 manifest structure, and I think I read somewhere that you can list a plugin order?

Here's what I need, if possible:

requires "friends"

suggests "friend_request"

<must be below> "friends"

<must be below> "friend_request"


Of course since friend_request isn't mandatory the "must be below" shouldn't prevent it from being enabled if friend_request doesn't exist.
The manifest documentation doesn't really go into this much detail, can anyone provide me an example please?

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