How can I see advanced network parameters?

qBittorrent can set the max number of connection in first tab of program preferences. I think this is what you are looking for? If you think an option is missing, tell me.

As a default, encryption is enabled but not forced. This means that incoming and outgoing connections are allowed but not mandatory. If you want to allow only encrypted connections, you have to set the option to 'Forced'. Please note that there is a documentation (http://wiki.qbittorrent.org) and this is explained iirc.

Thank you for using qBittorrent.

The option I was looking for is actually num_uploads as per libtorrent api. The maximum number of uploads it will do at any given time.

I've seen defaults come everything between 2 uploads at the time (slow connections) and 30-40, which is quite a big difference.

And encryption works exactly the way I hoped.

I see this option is indeed missing, I'll add it in beta 7 (or maybe 8). In fact, I'm planning to redesign the options and add the missing ones. Make it clearer and more exhaustive (maybe more µtorrent like since I like the ways its options are).

Great, thank you very much :)