First of all - thanks for all your great and hard work!
Tixati is the best torrent client, with so many option for customize! - I love it! :-)

Some question and idea if it posible and have sense to you and others.
In old days when I use other torrent clients - they have pause option. Is it posible to that function be added to Tixati also!?
My use case:
I often use many, many torrents, so from time to time I have issue with enough free space. If I stoped active torrents (just to find a way with free space) - later I have problem to find wich torrents was active and wich is not.
With pause option - this scenario will be to much easier.

/ Sorry for my bad english. :-/

What is the difference between this and stopping the torrent?

Please enable Categories in settings: https://support.tixati.com/categories

There is no pause event in the bittorrent protocol, there's started, completed or stopped.
http://bittorrent.org/beps/bep_0003.html#:~:text=be%20re%2Ddownloaded.-,event,-This%20is%20an

I know you say pause is "not possible" in the BitTorrent specifications.
But this could be implemented another way; by means of download slot management, like adjusting the download slots from 3 to 2

Try and think of it that way?

So a download slot can be removed for 6 hours, slot size reduces (minus 1) from 3->2 for that time until countdown expires then back to 3 slots
Does that make more sense? Rather than saying its not possible? Nothing in the specification says you could not do it that way?

I am also a former uTorrent user, and "Pause" is something I still miss to this day. "Pause" is something that I intend to "Resume". "Stop" is something I do not. It just makes a huge difference when it comes to usability of anything in-progress. And seeding/downloading is a continuous act.
When uTorrent got bought and people started to migrate elsewhere, I remember heated discussions on qBittorrent's design philosophy in this regard: "Paused is Paused. Stop means you don't want to seed later, so you can delete it from the client, it doesn't make a difference."

That's an unintuitive workaround. And only one category can be added per torrent.

BEP-21 event=paused (which is perfectly named from the technical/protocol point of view) exist.
But like most of us don't care about what IO operations happen when we pause a music in our media player, we don't really care about the protocol events here either.

+1