1) Punto has a prolongated nose and front area before wheels is longer than other cars. This area hits most of the times during negotiating a pothole or tall speed breaker. I would suggest you to keep this in mind. Also, if you are still not satisfied go for a 195/60 R15 tyres which come on E+. It would increase the GC by 2 mm if calculations are correct.
2) This is a new feature which is implemented differently in different cars these days. This is just to avoid the driver to inadvertently cranking the engine when it is already running. In Punto you need to completely switch off to crank. In some cars, you need to press clutch to crank the engine again.