Oh yes.
Under Foot is incredibly powerful for Corsairs, as are
Fierce in Despair and
Raider Halberd and
Red Wrath-all cards that look like they are for Southrons, but splash to any type of Raider. I had considered trying to play
They Are Coming with a few Goblin Runners to maximise the
Under Foot potential, but then you basically do have the Moria Navy. Other splashes can work with Corsairs, but remember that you can't recycle them in the same way as their cards. One exception to this is
Southron Leader, who is almost always with a slot.
Wind that Sped Ships is an interesting one. Personally, I'd have a couple at least, if nothing else just for
The Tale of the Great Ring. It might be less useful against some fellowships, in which case discard it, but if it is being useful, why not keep it recycled? But as you say, beware of clog, so be ruthless if it isn't pulling it's weight.