Deluge operations in Custom triggers and functions

Deluge operations in Custom triggers and functions

Hello,

I have 2 questions about custom triggers and functions:
  1.  Is there any place to find all the available operations and their JSON such as `ADD_APPROVAL_STAGE` and -`UPDATE` for request? 
  2. Can I cancel the action which triggered my custom trigger?
    E.g. On request approval/rejection I want to prevent approver from adding comments. I couldn't find a way to disable comments and `Need clarifications` button.  So can I stop the action taken?
Thank you,
Ilias

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