If you back up files onto cd they become read only. If you copy them back to the hard drive, select them all and go into properties, you can unselect read only. You will then have to reburn them.
The idea of cd is not as a working environment, but a backup environment. Its far slower then hard drive access anyway.
You could use IN-CD from Nero. This makes a cd-rw become a huge floppy. BUT, the downside is, take it to any other machine without nero and you cant read the damn thing.