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uh oh, another "while you're in there"...
Anti-siphon/backflow valves are supposed to be used on hard-lined irrigation systems. They keep ground water from getting back into the house system. It's probably code but the city might not check.
There are water-hammer arresters(basically a vertical pipe full of air) which provide a cushion effect near the source of the slamming. I think most of these require some overhead room between the joists(6-8in). There may be sealed ones with internal springs available which can be mounted horizontally.
You might want to check the main line pressure as well. Rent the gauge.
If stuff is getting taken apart, an individual shut off valve for each run is handy for maintinence.
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