The included speaker cables are about that long, I currently have one speaker about 10 feet from the base. There are no balance/fade adjustments on the hardware, and as far as I can tell the soundbar adjusts for surround modes but I'm not sure there are any software adjustments either.
My last system was a Bose acoustimass AM15, and while this system is not on that level, the sound quality is amazing. Considering this is a sound bar and wireless rear speakers, and not individual speakers, I am impressed.