Working again for me. Thanks. 

I've been wondering that myself for a few days now. Please bring it back, but maybe you want to limit/default the 'num=99999' to 'num=40' or so, it keeps my feed reader really busy and is probably very resource intensive for the server, too.

I would suggest tunneling (ssh/openvpn) all traffic through a (virtual) server hosted somewhere else, or even just seed/leech from there. Makes it a lot simpler and on the network side, you can be sure there's nothing interesting beside a lot of bandwith.

I would still consider it a bug that the first captcha is invalidated when opening a second tab.

Fortunately, there's an easy fix for tab loving people like me: Reload the tab, enter the captcha, then reload the other tabs with captchas (which should disappear now).