Ah ok, I thought you meant literally splitting them up during the fight. My group always has someone offtank Cho'Rush on the left side of the platform while we take Gordok down on the right side of the platform. This is for tribute runs of course.
No, Hunters can use a small exploit by some method of using a Freezing Trap and Feign Death to split a linked pull. I think it's been mostly patched, but it's still possible. I think there was a guild suspended for doing this in Molten Core a long time ago (not Conquest).