The casting time issue is addressed in the official Main D&D rules FAQ, on pg 43:
(
http://www.wizards.com/default.asp?x=dnd/er/20070523a)
How long does it take to activate a scroll with an identify
spell on it? How about a scroll with any of the summon
monster spells or a wand of summon monster?
Activating any magic item is a standard action, unless the
item duplicates a spell effect that has a longer casting time or
unless the item description specifies a different casting time.
The sections on spell completion and spell trigger items should
include the caveat that activating the item takes as long as
casting the stored spell would take. Thus, it takes 1 hour to
activate a scroll with an identify spell on it. A scroll or a wand
with any of the summon monster spells in it takes a full round
to activate, just as casting a summon monster spell does.
A command word item takes a standard action to activate,
no matter what the casting time of the spell it duplicates. In
general, command word items don’t duplicate spells with long
casting times.
Cheers,
Roger