Citylight

I just finished the first version of a throttling program that uses the environmental variable LD_PRELOAD to overwrite the read/recv and write/send (and many others) in order to throttle the banwidth used by that program.

It's just a test but it still works surprisingly well (for one day of coding :)

Ldthrottle - LD_PRELOAD bandwidth throttler

If, for some reason, you need to totally disable sharing in rtorrent (and every other application using libtorrent) and look as if you always had 0% of the files you are downloading, download the source of libtorrent and patch it with the attached diff.