You can add up to 20 custom clicky items by adding "Clicky##=item name" to the MQBot section of your character INI file.
For example, to add the Enchanter's Epic 2.0, Staff of Eloquence, add the following:
Clicky0=Staff of Eloquence
Bot will recognize Clicky0 through Clicky19, and supports If conditions as well in the form of ClickyIf0 through ClickyIf19.