I don't think a singing section is possible without upsetting a few people, whether you have it in NT3 or ET2 season ticket holders will have to be moved. NT3 would have been perfect but I guess there is an issue with home and away fans clashing.
If we get safe standing in England I doubt we will be first to convert.I wouldn't call it a whole seperate issue - the return of terraces would sort out the singing / atmoshphere question in an instant.
The task of managing to get a decent singing area should be child's play compared to getting safe standing pushed through, but we can't even manage this.