Yes
Yes
In my opinion, it doesn’t really count. It could take about five seconds while you install something offline, but that’s all.
Smart display alerts you about digital signatures and popularity using a program's signature. If a downloaded app warns it isn't trusted, it might be risky. This tool aims to help regular users who rarely install software from unknown developers. When you choose to download something, it will ask if you trust it—usually just one click. After approval, it won’t bother you again while the program runs.