Just follow the instructions on xda, it's really easy. With root Explorer you can extract the zip, copy the file, and paste it to the specified location. Say yes when prompted to overwrite, restart, and that's it.
I use widget solid to replace the old power widget, including the wifi toggle.
I've actually found the persistent notification somewhat useful.
I have a dual-band router and in certain areas of my house I get a better signal with 2.4 instead of 5. The persistent notification makes it easier to switch.