Four possibilities exist for a listviews multi select
capabilities:
None-
The listview cannot multiselect at all.
Default-
The multi select type (with or without shift) depends on
the users preferences setting.
Shifted-
Overrides the users prefs, multi selecting only together
with shift key.
Always-
Overrides the users prefs, multi selecting without shift key.
Please do *not* override the users prefs unless you have a
good reason!