There is a switch for the overboard macerator option. But I believe it's controlled at the breaker panel (labeled 'overboard discharge'). I re-purposed that breaker to power my wifi gear since I don't have the macerator option.
There was at least one ACC switch at the helm that went unused. I put in some underwater lights and ran them through it. I've never seen a fuel transfer setup in a Vista. Might have been added by a previous owner. The switches are standard (made by Carlton) and can be ordered with all sorts of label options.
In our 348 the vacuflush switch on the backsplash above the sink charges the vacuum pressure. Which is released when you press down the pedal. The pump will automatically repressurize the system if you leave that switch on. The main power for it is controlled at the breaker panel. Since ours has a leaky seal I tend to keep it powered off at the panel most of the time and only power it up when someone needs to use it.
I give guests a run-down on how to use the toilet, and also suggest they use shore facilities one last time before we get underway. Since we have a small kid I also keep a supply of doggie waste pickup bags attached with a zip-tie to the toilet paper dispenser. This I point out to the ladies on board in the event they need to dispose of anything. Everyone gets the point.
Like these:
http://www.buybuybaby.com/product.asp?SKU=14991573
But you can get similar sort of stuff at a pet store.
There are other toilet system options and some do have a flush switch instead of the pedal. But I don't know that FW ever used other options (besides manual pump ones, of course).