That's incorrect. All code authenticode signing certificates (trusted by microsoft) turns the UAC prompt from yellow to blue. EV certificates is probably for auto-trust for smartscreen.
Yes, that's correct. EV just skips the reputation building phase.
Source: https://blogs.msdn.microsoft.com/ie/2012/08/14/microsoft-sma...
> Programs signed by an EV code signing certificate can immediately establish reputation with SmartScreen reputation services even if no prior reputation exists for that file or publisher.
No user will understand this though.