(defcustom mouse-sel-mode nil
"Toggle Mouse Sel mode.
When Mouse Sel mode is enabled, mouse selection is enhanced in various ways.
-You must modify via \\[customize] for this variable to have an effect."
+This variable should be set only with \\[customize], which is equivalent
+to using the function `mouse-sel-mode'.
:set (lambda (symbol value)
(mouse-sel-mode (or value 0)))
:initialize 'custom-initialize-default