1. Depends on the company.
2. Rebalancing is simply a measure to keep you from being over-weighted; you pick the overall risk level you are comfortable with and rebalancing keeps it in check.
3. Probably but I don't know of any.
4. Some do, some don't.

Sorry this is pretty vague but because I work for a financial company, I'm bound by red tape as to what I can/can't say on a msg board.