Vibram Men's KMD EVO-M

is this good for water shoes? ive seen the other one but i dont really like the style of that i like this one better

This shoe says it has an injection shank plate. What is this for? Is this some kind of minimal arch support?

Anyone ever wear them with toe socks? Do you add 1/2 size?

Two questions: do these provide good arch support, and are they good for trail running?