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A stupid answer, but since it's probably using the same "api" that the regular iOS notifications, wouldn't a simply Cydia notification cool tweak do the trick? (I forgot the name of the one I saw once, since its name IIRC is not related to anything at all).
Also other notification tweaks like the one that makes notifications smaller, should work?
 
You can't. All you can do is turn on/off banners for specific events and whether or not a sound plays.
 
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