Setting to delay replay of same songs in Flow

Most of the time I use flow, but it ends up playing the same songs over and over and I'm even getting tired of hearing the same songs all the time.

Can't you add a setting whereby I can stipulate that it should not play the same song in Flow in x amount of days so its forced to play more variety? That way I can say don't play the same songs in 30 days to force unique songs to be played over for a long time...

Thanks