Yes,you are right. The problem is framework.How hard would this be to do? Not asking for a ETA or anything of the sorts. Asking out of curiosity, as I'm sure many of us are wondering, what would we all need?
I remember one of my favorite Note 2 rom's was MiUi crossed with some TouchWiz functionality, UI and app's and a crossbred rom would be awesome and another dream come true.
I know framework would be a big problem I think, what else is there.
You can have TW feature in miui ROM because miui ROM use firmware samsung with overlay of miui.
CM rom based use source code,so cant use feature of manufacture without source.