Footers and margin-bottom

Hello!

I'm looking for your help again with another question about footers. 

I try to create document, which will be printed on a paper with pre-printed
logo on the bottom of the page.
So I have to create footer around the logo.

But I have a problem when I try to ajust margin between footer and bottom
edge of the paper.
I thought this parameter is conrolled by [margin-bottom] attribute of
<fo:simple-page-master>.

But when I try to change it, it only changes margin between region-body and
bottom  of the page.
The footer is always stays on 1.25 cm from the edge (at least, Word 97
showing this value in its Page Setup), 
but I would like to make it 6mm.

I know that footers is a new feature in jfor, so may be this is not
supported yet.
Or should I use some other attribute?
(I've tried to change <fo:region-after extent> but it does not help).

Thank you,
Serhiy


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