A Tiger (top) hash is actively used in Torrents, and we could add it.
See 
http://wiki.depthstrike.com/index.php/P2P:Protocol:Specifications:Optional_Hashes

We would need to use the reference implementation from 
http://www.cs.technion.ac.il/~biham/Reports/Tiger/ and it looks simple enough that 
it would be possible to cook up native Python bindings for it. 
http://www.cs.technion.ac.il/~biham/Reports/Tiger/tiger-src.tar.gz

Or maybe there is already another implementation that could be used.

Priority of this feature is not very high, though.