4. The Document title value can be set using JavaScript - document.title = "my document name";
3. Opus places all the main content inside a DIV which is a child of the BODY. The BODY fills the entire viewport and you can set a colour or image in the publication properties. The DIV basically holds child DIVs each representing a page in your publication. They fill as much of the viewport as you specify in the chapter size properties or in accordance with the scaling value you set. Additionally, the DIV can be aligned to the top or centre of the viewport during publishing.
2. They have instructions on using responsive scaling:
http://www.digitalworkshop.co.uk/soluti ... sign.shtml</mack>