Hello,
UPDATE: phpdocx 15.5 includes new options to rotate text boxes.
The current stable version of phpdocx doesn't include an option to set a custom rotation value with addTextBox. It's a work in progress that will be included in a future version of phpdocx.
Regarding the footer question, MS Word doesn't have a last page target when adding a header/footer. MS Word supports first (title), default and odd targets. To accomplish this task you need to create a new page section and add a footer, so it'll appear as the footer content in the last page (section). The addFooterSection method included in phpdocx 14 allows adding footers in specific sections.
Regards.