if you want to use all the features of KDE, why don't you just use KDE? What is the point of backporting KDE features into GNOME? I mean I can see the reason, but seriously, the apps only depend on themselves and QT, so are you really that stubbon that you want to have people port KDE features to GNOME because your too stubborn to install QT libs and KDE libs?
What are you talking about? Because I like one feature of KDE then I have to used it despite all other features I like in gnome? So what you're saying is you like everything on gnome and nothing from kde? It doesn't make sense. Good things can be copied. I think gnome has the most advantages to my taste and that is why I use it, but whenever a kde application is better I use it in a gnome-session.
The problem about trying to use plasma on gnome (it can be done) is that you have to install a lot of kde libraries and plasma is still very unstable, so I much rather have gnome's nautilus desktop, but with a little more power. The widget idea is not bad.