Re: CUA mode cursor color

[Richard Stallman]

    If you enable cua-mode via the Options menu, notice that the menu item
    for transient mark mode becomes inactive, ie.  the user cannot easily
    change the setting of transient-mark-mode while cua-mode is
    enabled...

He could do it with M-x transient-mark-mode.  So perhaps you should
change that command so that it gets an error if CUA mode is enabled.
It seems like a good idea to do that.

With that change, it is clearly a good idea to restore the value of
transient-mark-mode when exiting cua-mode.