Long as it's not something that goes on the Asset Store and you credit its usage, yeah it's fine.
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His bloom is really good and I think better looking and more controllable than the post processing stack one. It's probably the best thing I've bought on the Asset Store. Main reason I've been trying to move to using the stock stuff is just to reduce dependencies on third parties.
It's the bloom that's in the Post Processing Stack. It has an official release now, you can download it on the Asset Store for free. It's by Unity themselves. It's great for a lot of stuff besides the bloom. Hopefully they include it in future Unity builds so you don't have to download it and more people know about it.
I'm not sure what you mean either about it being difficult to control. All it does is apply -5 m/s downwards velocity and nothing else. When FCS disconnected, gear down shouldn't have any effect at all on the way the ship flies.
Strafing would make a lot sense.