I would like to put a link to AniDB into my eMule's webservices popup menu so that I can easily update my mylist when files have finished downloading. However, I'm a lazy POS.

So if I'd use an URL to the ed2kdump feauture, I can only add new files but not update those that already exist in the mylist. And if I use an URL to the massupdate feauture, I can only update existing files but not add them to my mylist.
Hence, I wish for an addition to the mass update feauture, like this:
http://anidb.ath.cx/perl-bin/animedb.pl?
show=mylist&
do=autochg&
hash=ed2khash&
watched=0/1&
state=unknown|onhdd|oncd|deleted|shared|release&
add=0/1
hash is of course the hash part of the ed2k link.
watched and state are just that.
add determines whether a file that has not yet been added to the mylist should be added. If this is 0, only existing files will be updated. If it is 1, existing files will be updated, new files will be added with the watched and state flags taken from the URL.
Basically, this is the same as the current massupdate feauture, except that it has the added add flag, takes only one file hash and skips the ed2k:// link parser.