The same problem is with me too.
I have some specific information (for example port no, Device sr no etc.) to send along with alert. In version 2 I used field 3 but I am very new to version 3.
_module_ and _alert_ macros has been added to Server code several days ago, they are replaced by Module Name and Alert Name. Mechanism for Commands, Actions and Templated will be described in depth in documentation, now in preparation. Basicly, an Action is the very basic "command execucion", and an alert template is a generic trigger definition, you put an alert template over a module and produces one or several actions when is triggered. Actions, Command and Templates are reusable, so if you modify a template, all alerts using it are modified.
