Just as a note the Ipdf specification on
Open Publication Structure (OPS) 2.0.1 v1.0
has the css tag
oeb-page-foot
Code:
The content of an element assigned display: oeb-page-head should be presented only as a header, and the content of an element assigned display: oeb-page-foot should be presented only as a footer. Neither should be simply presented as if it were inline or block. Reading Systems, however, are free to present headers and footers either in special areas as usual for paper publications, or to make them available in another way. For example, a device with a small screen might instead pop them up on demand. For purposes of page layout, these display values are similar to block boxes with an absolute position (i.e. a position value of fixed or absolute). That is, they are removed from the normal flow and a new block box is created with its own flow. Margins, padding, and other block characteristics are determined as if the element had position: fixed set.
which would be what you want. But ADE does not implement this feature.