Anyone using torrents or other P2P services is automatically uploading if they are downloading. Even if it is just for the duration of the downloading of the files.
-Carol Haynes
Some P2P clients are easily disabled from uploading, without affecting download speed. (torrents are not the only way to get files)
1. Don't forward ports.
2. No server permission in firewall.
3. Don't share the downloads folder.
And there are ways to look like you are sharing when you are not. Depending on your software, you'll have a file list showing but nobody will be able to download them.
1. Don't forward ports.
2. No server permission in firewall.
3. In some software, you can share from a data CD or USB drive, removing the disk or drive before connecting, and then don't refresh the library. It will appear as if you are sharing the files but since they aren't there any more, uploads will fail.
4. Use a
queue hack.
Now why would you want to look like you are sharing files when you are not? Well, some P2P networks have chat, and some chat hosts have bots that will automatically kick or ban you if you are not "sharing". Some have a minimum file count requirement, some have a file type requirement, etc. If all you are there for is to chat, not even downloading, you can avoid a lot of the hassles and autokick bots if you just look like you are sharing. If you get caught, just cry "corporate firewall" or "ISP filtering" and they usually let you slide.
Now I don't advocate this kind of fake sharing, because it spoils P2P networks by adding undownloadable stuff to search results. I think if you have control over what folders you share and can disable sharing your downloads folder, then point it at a folder full of Creative Commons, public domain, and open source content. (yup, that's what I share, along with my own stuff, and I usually don't download. I am just there to chat with my friends and provide free tech support.)