one worker only belongs to one worker group，it will waste the server resources。

For example， worker A which belongs Group A will busy in 9 - 10 pm but be free in the other time，it's better to supprt worker A belongs to many groups to make the server be used fully。

In the last version, it can be configured in the Web . it's very usability。So I hope it can be reserved and off course considered the normal situation and the Dorker situation。