I just read the documentation from painless. The relay that goes along with the cutoff switch is there to provide a load for the alternator when the cutoff switch is in the off position. This will prevent the damage that GregWeld was warning you about.
One thing that I would change in your circuit would be to connect a heavy gauge wire directly from the cutoff switch to the remote starter solenoid instead of going from the cutoff switch to the bus bar and then to the remote starter solenoid. You don't want to run the starter current through the bus bar as the bus bar may not be able to handle that current and it will present an additional resistive load that will steal power from the starter.
As far as adding switched bus bars, I can't think of any other way except to add high current relays downstream of the bus bars that you currently have. The relays would use the positive voltage from the ignition switch when in the key is in the run/start positions.
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