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Which ones are clickable from inventory? All of them?
If they are restricted to specific classes then they cannot be clickable from inventory. So, only Clickies usable by all classes can be clicked from inventory, although some of these must be equipped but are ALL/ALL. --Ravhin 15:45, 1 August 2013 (UTC) -Except, apparently, the clickies that let you reclaim energy from pet summons. They are mage-only, but they are popular with all pet classes.
10/9/19 added info about special uses for instant clickies taken from here https://www.project1999.com/forums/showpost.php?p=2979580&postcount=1