After playing for a while I also thought it would be cool if once game is finished we could see updated sales, for example fans can also buy album later, not just on the month when it's released. Like we can see popular groups can still sell their debut albums years after the debut.
And this makes me think if we for example don't release just a digital single but an album and we print like 40k albums, after a while fans could demand us to print more albums because albums are out of stock. I think it would make the game interesting, we could also lose fans if we decide that we won't print the album again because maybe we are broke.
Also it would be cool if we didn't get accused about singing about political songs when we actually didn't even release such song. For example it happened to me - I only did photoshoots, I didn't even release any singles yet and I got accused that my group was singing political lyrics, it would make sense that this only happens when we actually release such song.
And for example when we release a physical single we could create album cover or pick an album cover. Maybe if album was cheaply made fans could be mad at us.
And maybe it would be cool idea if we could somehow give news to the fans that we need help (like makestar project where fans donate money for a comeback) otherwise the group will disband because we are broke.
Maybe we could even decide how many seconds of lines some girl gets and fans could praise us when the most popular girl gets the most lines but others could be mad because we treat some unfairly. And because of that I also got another idea, we could also just have the rapper of the group, a vocalist a sub vocalist (so we'd give girls positions) and if fans complained we could tell them "this member got less lines because they are the visual/rapper."
I'd also like if we wouldn't have to bring the girls to our office every time when we want to interact but sometimes they could also visit us by themselves when they are bullied for example or when a snitch wants to tell us something.
Also maybe we could have fan meetings and girls mess up and they tell something they shouldn't and we must make situation better with our reply to the public. And for paying the girls idk about Japanese idols much but some Korean ones for example don't get paid from the start because they must pay off the debt, this would be really helpful at the start for us as a ceo.
And also 5 to 7 year old contract and idol can not leave, if they do we can sue them (I sound like an evil ceo) but I really hate it when someone says I will graduate before I turn 23 because that doesn't tell me much, they can graduate when they turn 20 because that's before 23rd b.day. I'd really like to control how many time the girls will stay in the group so I can prepare new idols to join. That's why I think it would be cool if we had a "rookie" category and for example they can be rookies for 2 years before they join a group so we can train them well... because some idols that want to join are so untalented lol)
Anyway I hope that some ideas are good enough to end up in the finished game.