The following post-functions are provided by catWorkX OTRS Integration for JIRA:
This post-function is used to create a ticket in OTRS.
[cwx] Update Otrs Ticket Postfunction

OTRS tickets can be created via action as well as post function.
When using as post function queue and customer selection can be configured via a typically configure post function dialog:

To update the OTRS ticket please select the Update Otrs Ticket Status Postfunction from the available function options:

Here you can enter the new OTRS queue and status (the later by name or ID). Furthermore the mapping can be activated.

JIRA provides two issue actions for creating and commenting of OTRS tickets. Only the Create OTRS Ticket action is effected by some configuration:
No configuration necessary