org-support-shift-select

org-support-shift-select is a variable defined in `org.el'.
Its value is

nil

Documentation:
Non-nil means make shift-cursor commands select text when possible.

In Emacs 23, when `shift-select-mode' is on, shifted cursor keys
start selecting a region, or enlarge regions started in this way.
In Org-mode, in special contexts, these same keys are used for
other purposes, important enough to compete with shift selection.
Org tries to balance these needs by supporting `shift-select-mode'
outside these special contexts, under control of this variable.

The default of this variable is nil, to avoid confusing behavior. Shifted
cursor keys will then execute Org commands in the following contexts:
- on a headline, changing TODO state (left/right) and priority (up/down)
- on a time stamp, changing the time
- in a plain list item, changing the bullet type
- in a property definition line, switching between allowed values
- in the BEGIN line of a clock table (changing the time block).
Outside these contexts, the commands will throw an error.

When this variable is t and the cursor is not in a special
context, Org-mode will support shift-selection for making and
enlarging regions. To make this more effective, the bullet
cycling will no longer happen anywhere in an item line, but only
if the cursor is exactly on the bullet.

If you set this variable to the symbol `always', then the keys
will not be special in headlines, property lines, and item lines,
to make shift selection work there as well. If this is what you
want, you can use the following alternative commands: `C-c C-t'
and `C-c ,' to change TODO state and priority, `C-u C-u C-c C-t'
can be used to switch TODO sets, `C-c -' to cycle item bullet
types, and properties can be edited by hand or in column view.

However, when the cursor is on a timestamp, shift-cursor commands
will still edit the time stamp - this is just too good to give up.

XEmacs user should have this variable set to nil, because
`shift-select-mode' is in Emacs 23 or later only.

You can customize this variable.