There is no way to continue a line on the next line, and
therefore no way to have a single paramenter with a value
longer than about 8,180 characters.
However, if your desired config is simply a big list of allowed hosts, and
it doesn't fit in that limit, you probably can simply duplicate the block
and put as many hosts as will fit in each block.
--
Jeffrey M. Vinocur
jeff at litech.org