Usually I'd make a feature myself, but I won't have the opportunity for that in the next few months. Therefore I post this feature suggestion here; anyone pick it up if you feel like it.
In the game lobby, if either 75% or all but one player is readied up, a big horn button appears. If you click it, the horn will sound at the non-readied players to ... ehm... alert them that they're being waited for Is that possible? (Even if the person has the fa lobby alt-tabbed out?)
Cheers,
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Rien