Si

No probs.

Just read what Steve said about render passes for reflection.

Just last night I fancied watching the making of Star Wars Episode 1 extras (making ofs etc.). In the deleted scenes section they show a waterfall sequence that was deleted from the film but then for about 10 mins show how it was put together. The guy who did it rendered out the submarine separately with a 100% reflective shader and nothing else. He then comped it in after and adjusted the opacity until he was happy with it. So it may help to break down scenes and save them off in pieces for different passes altogether as well.

The guy also show the shot from a completely different camera too, it was a real mess looking at it, but the actual shots were awsome. Oh and just to really piss you off, they used pouring salt for the water falls and shot those on black backgrounds and then comped that into the matte as well, particles were used but very sparingly just to add fluffy bits of spray.....none of this fluid lark, hey ho!! Easy when you know how,

Cheers
Jay