As usual, check names/vehicle reg No/VIN/Engine No. on insurance and geran is correct

Check all lightning that should lit up/blink as normal
Check all knobs and stalk turn properly
Check air cond function
Check paint for discolouration/scatches/chips
Check boot contents
Check engine compartment

1) I would like to think that Mazda has done sufficient engineering to ensure robust performance from its engines over the course of 100,000kms at least. I do wonder how people in Malaysia use i-stop when they have their A/C on almost permanently.

For me, i-stop works well when I have the A/C turned off. I can keep the engine off for a good 2-3 minutes.
When it is on, I find that my engine only cuts off for less than a minute. Then it restarts itself when the compressor kicks in.

2) Not sure.

3) Normal in my experience. Usually happens when the system has not charged up enough.

4) That's good to know. I normally do it manually if I have to

Not really a trick, but holding the Nav+Back+Mute buttons will reset your MZD. Had to do it on a couple of occasions when the Nav absolutely refused to start (just showed me a compass).