Basic plugin for Sublime Text that adds a "Toggle Readonly" command to the context menu.
If your using the Sublime Package Manger hold down Ctrl+shift+p and type
Package Control: Install Package. Then search for
toggle-readonly and hit return.
If your not using the package manager then
cd into your Sublime packages directory. (On Linux this is ~/Sublime Text 2/Packages) Then run this command
git clone https://github.com/reflog/toggle-readonly.
To use the command right click on the file in the side bar or in the buffer area.