Pier questions [Part 2]

Hi list, I'm back, trying to configure Pier. The first step I need to achieve is having a blog running but with comments disabled. While doing so, some questions appeared: 1. It seems that the "Add" button has different meanings depending on the current selected page (environment? I still don't know exactly what this is in the Pier case). So, you can use it for adding a page in the main environment but only to add a post in the blog environment. Is this correct? Is it supposed to work in this way? 2. If the first is correct, is there a simple way to change the link caption, so that when the user is in the blog page the link states "Add Post" instead of "Add". I don't think that the previous approach is intuitive. 3. Is there a simple way to avoid leaving comments in blog posts? 4. Is there a way to configure the contents of the left sidebar. thanks for your help. -- Best Regards, Andrés