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Great suggestion, this is something we really need in the game.
I think the problem here is that IGG (at least CC team) feels like having rather sloppy coders / ux designers. Many features they introduce feel a bit off and not tested properly imo. The suggested feature is pretty big new component and even though they have many "close to this" features it requires alot of thinking and work to make what we really ask for. Also, they patch monthly and I doubt they would do something like this in several months work since they don't get money out of it directly.