should be ok. Just do some searching here. There's an issue with getting the installer to work. I've just installed rosetta from my snowleopard install disk, but there are some that say that's dangerous and have an alternative method.
I have FCP 6.0.6 running on my iMac without any issues...
Actually I have final Cut Studio 3...
Could you please clarify: according to the Wikipedia entry for Final Cut Studio, version 3 includes FCP 7, not 6.
You should never attempt to install Rosetta into Lion or Mt. Lion. At best, it just wilt will not function and at worst it will cause problems with your system. Just last month, a poster to this forum indicated that his version of Final Cut stopped working after he attempted to install Rosetta, in the misguided hope of installing Compressor.
That being said, Michael Grenadier is one of the acknowledged experts on Final Cut Pro on this forum and I am sure he will guide you through one of the alternative installation methods he indicates are available.