At the moment, if you want to get players into your battle room, you need to ask on the chat, or personally harass potential players.
On the other spring server, there's a "!promote" feature on battle rooms. Sometimes people use it to call others to join. It's not very well implemented though.
There could be a "call players" button on the battle room UI
some ideas about what it could trigger:
- text line would appear on each of a few channels asking people to join (maybe with a clickable link that'd make people join the battle when clicked), but it should disappear or change color when it becomes stale (game started or happened long ago)
- text line would appear on one of the ZK discord channels
- blinking highlight for that room on the battle list for a minute unless the game started
- maybe a button could briefly appear the same way it does for the MM
