when mirroring a list of 20.000 files within one website 
tree, a subset of html-pages, with a lot of also outside 
this subset pointing relative crossrefs, I can do this in 
several ways, but none is satisfying.

-g will put them all unmodified to one directory level, so 
the tree structure is lost and duplicate fienames at 
different subdirs are lost. 

-* filter forces endless scanning for decision of int/ext 
references; No Expert option for "as is" int/ext refs 

-r0 forces writing the .readme files, wasting disk space 
(large NTFS blocksize)