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The better AC systems cycle the compressor on and off to maintain set temp - cheaper systems run both the heater (with hot water from the engine cooling system) to temper the AC's cooling effects. Horribly wasteful but there it is.
AC clutches are pretty reliable anymore, so I wouldn't worry about it. I turn my AC off whenever I approach an uphill during my travels, and my car is 12 years old. No problems yet.
Every 5-10 seconds sounds pretty frenetic if you ask me. I think that would affect the drivability of the vehicle, certainly I can feel it whenever my AC comes on.
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Lead or follow. Either is fine.
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