You must press Command-V or Apple-V to paste. Another thing that somewhat irritated me is the fact that there is a paste function in the menu, but when you right-click and select paste, it tells you that you can't use paste.
It didn't have as many standard or generic icons. I'm not a super user, and there might be a way of doing it that I haven't explored, but I was looking for some specific icons that are just standard icons, and I found the icon library to be very focused on architecture icons.
