xsl-fo: mixed page layout & column orphans/widows & ve

Hi all, just three quick questions:
 
mixed page layout:
1) if I set up a page with three columns and put a number of blocks in it -
a mixture of text and tables, how do specify that I want a table to span
multiple columns? note I am not talking about spanning cells here - I have a
table that is bigger than the width of the page columns so I want to flow
into across two page columns.
 
column orphans/widows:
2) if I have a block which contains one line of text on its own how do I
stop this - I can see how to do it for a page but how for a column? i.e. the
line is on the 2nd column at the bottom and I would have preferred it to be
on the 3rd column at the top.
 
vertical column balancing/distribution:
3) if I have three columns and fill it with text (say about 90% full) then
the last column will only be abut 70% full - is there anyway to increase
the distrubution of blocks of line spacing to get it to fill the whole
column
 
thanks in advance!
 
Philip.


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