I like converting the mainline into hose thread fittings, and then screwing a 2-valve garden hose Y onto that.
That gives you zone control and also, future changes require only unscrewing the garden hose thread, not taking apart irrigation fittings. And you can always slap a short section of garden hose anywhere you want as if you had spigots everywhere your irrigation mainline runs.
Actually, I like turning every Tee or branch into a four-way with valves, probably because I like gadgets.
