After starting what is possibly my fourth "playthrough" of Idol Manager, I ended up having a few ideas during the initial dialogue sequences. I think it would be great if we could have some sort of pause menu during dialogues (kinda like the in-game 'Settings' tab, but adapted to the dialogues). I really wanted to mute the game during my intro sequence, but the 'M' shortcut didn't work, and I couldn't open the settings and mute the in-game music, so I had to play through the whole dialogue before being able to fiddle with the settings.
Other than that, I kinda wish Idol Manager would feature some sort of 'bio' section at launch, once the multiplayer features are added to the game. You know, maybe being able to set up a 'profile' for your group, with a customizable bio, some basic stats about the group and its members, singles released, concerts, and other stuff. All this information would be available for other players to read. In order for this idea to work, Idol Manager would need to have some sort of indexing system, where the player could look up Idol names, Player names, Group names, etc. Then, the player would have to hire scouts (or maybe have managers do the scouting), so they can gather even more, in-depth data on the desired group. Every week or so, the scout/manager could update the dossier on the targeted idol/group with new info, so then the player can decide if they want to snatch any idols, or even possibly pick some other intergroup interactions (how cool wouldn't it be to have some sort of interconnected SNS tab, or even a 'News' tab featuring other groups!). Of course this is a lot of work, and since you devvies are aiming at a 2019 release, I don't think that would be an achievable goal. You probably have the whole influence thing to work out before you even get to the point where IM can be actually considered a multiplayer game. Still, the idea stands, and even if 90% of that is impossible to be impleneted into IM, just having the ability to write your group (and maybe even yourself, staff and idols) custom bio sections, doesn't matter if it can be read by others or only by the players themself, would be quite nice.