Custom application and incident with third party integration for tickets?

[Joshua Prakash]

I have created an Application called "x_help_desk" which creates records in the incident form with cross scope privileges.

The end-user selects phone number(custom field referenced to x_help_desk table), subcategory(choices added to the incident) from the record producer. The incident integrates with a third party application to create a ticket on the third party application and the ticket id is populated on the incident form.(inquiry id)

Is it a best practice to combine the custom application with incidents? 

How does cross privileges affect incidents?

What conflicts may occur when moving the update sets with cross scope privileges?

Please check the attachments below.