How do I enable the cvs edit command?

When I right click on a file and select the VCS menu I can see 'Commit', 'Update', and other options. But there is no edit command.

Thanks.

There is no edit command because it is not necessary. Once you have made changes to your code or document, use the commit command to reflect the changes in the respository

I have the -r flag set on my .cvsrc so files are checked out read only. I then use the cvs edit command to keep track of files being edited. As a company we can see who is editing all the files. When the file is committed the file is reset into read only mode by cvs.