No torrent client in android has a stop feature. Just a pause option which keeps you connected and your IP address on everyones peer list. My question is if you shutdown a Bit torrent app like utorrent or aDownloader do you disconnent from everyone and no seeding takes place. And if you remove a files and don't delete it does the file seed. II like the stop option on PC because you IP disconnects from everyone till you wanna start again. Also no all torrents are illegal I sometimes download Linux distros on my phone cause my 3g is faster then my satillete internet.