Add a "Rap" stat, add the ability to make a Rap song, add Albums (perhaps you'd have to hire an artist to do the album cover?) add a Music Video needed to make a single/album perhaps?, make it so that in your first group, ONLY the idols from your first group pop up (or add the ability to do that) (as in, rather than all your idols popping up when making a single for Group N1, make it so only the girls from that group pop up), add a, perhaps, bullying past/currently bullying member as a giant scandal (4 sp), add a mini-game like the Concert mini-game for the World Tour, and maybe add scenarios where your idols are being attacked for being a "bad vocalist" "bad visual" "bad dancer", or a "bad rapper", and maybe add a "training" period before you debut? and that's all I can think of!