Ooh looks nice :) I'll have a closer look later.
First thought if you haven't got it already. Flairs for each type of character (mr Fixit etc)
Edit: Okay, so the main thing I'm seeing is a few spots that are still bright white like text boxes. see this: http://i.imgur.com/FFJDmhM.png
Also decided I'd play around with some image borders, Results are interesting but i might have to do some fine tuning: http://jsfiddle.net/ULCGS/4/ :( I don't think reddit CSS supports this though...
Online player numbers are always fluctuating, but the Sauerbraten community is quite active on Discord, and there are tournaments almost every month (visit sauerworld.org).
Also, make sure you're playing on the latest currently version "2020 edition", released in December 2020 (sauerbraten.org). The protocol is different, so the same servers and players will not show up between different versions.
You can do such things only in singleplayer mode.
For commands you can check this link http://sauerbraten.org/docs/game.html#singleplayer_modes
Yea this command for enterinng the coop edot mode. But for editing the flag ent you can or find it with command /entfind flag, then by pressing . button you can set params for it. For creating flag ent use /newent flag .
About flag enity you can read here http://sauerbraten.org/docs/editref.html#_flag_
OBS Studio is a great way to record and gives you more file format options; however you are right, sauerbraten has a built in video recording using demos (these will save as .dmo file extensions in your main Sauerbraten folder) for more information you can view this