automatic scaling to landscape paper size leads to collisions

[pls]

Hey all,

I just discovered a command line option that is not mentioned in the docs: It's 
possible to append "landscape" to a paper size, e.g.

$ lilypond -dpaper-size=\"a6landscape\" inputfile.ly

There are a few error messages and lots of warnings but basically it seems to 
work.

Parsing...
programming error: Cannot find key `"a6landscape"' in alist, setting to `#f'.
continuing, cross fingers
programming error: cannot evaluate "#f" in module "#<module b61fc630>", setting 
to "(148.0 . 105.0)"
continuing, cross fingers
…
Drawing systems...
warning: cannot fit music on page: overflow is 35.344199
warning: compressing music to fit
…

I tested the command with different large scores with many staves/instruments. 
With the landscape-option larger scores collide with the title and the 
copyright tag, staves collide and are compressed too much. Without the 
landscape-option the automatic scaling always seems to work. Same result when I 
include either

#(set-default-paper-size "a6" 'landscape)
or

#(set-default-paper-size "a6landscape")
in the .ly file. Automatic scaling does not seem to have an effect on the staff 
size?! Is this a "landscape-bug"?

hth
patrick