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This!  I've been wishing for the possibility of double centers, too, and just having alternate formations would be really cool!  Not sure what would be a reasonable upper limit on how many idols to have in one single, but 15 feels a little small later in the game.  

As for the election, I'd also personally like to add a potential incentive to it by having the winning members be the lineup for a single!   It would make it more of a worthwhile gamble to rig the elections too.  It  would be cool to increase the limit based on that (maybe you could choose the limit based on the formations you'd unlocked or something?)