/old/one -> /new/one
/old/two -> /new/two
one action in the site-map is sufficient (mount it at /old/). Otherwise you would have to create 10 subfolders and mount the package 10 times. I wonder though if that is necessary in practice that often?
Anyway, here's the redirect package if you want to have a try: http://openacs.org/storage/file?file_id=118294