I agree, file type searching would be nice.

I would also like to see some sort of 'unable to connect' automatic research.

i.e. If you are unable to connect have gnucleus automatically research for the file every say 10min. This shouldn't put undo stress on the network but would mean people don't have to constantly hit right click and manually research. Files that are busy already automatically research (default is 30s). This would also be especially helpful for people like me who are behind a firewall and cannot download from others who are behind firewalls.