Allow backfill in the new arcade modes

[Tealos-1658]

Figured I’d add this here in case anyone missed it:

@BillWarnecke

Hey there we’re working on a server side update that will change the threshold of players required before shutdown and also properly enforce penalties for leaving. We hope to roll this out within the next couple hours.

Cheers

This has since been implemented, and works as described in my previous reply.