Hi.

I'd suggest to check my response on this thread:

It matches exactly your Use Case.

Please let me know if I could be of further assistance.

Sincerely,

Elvis.

Hello, 

Far as I understand it can’t be done, it’s hard coded in to the system. Could maybe contact the support. 

A workaround could be as Elvis mention or you use tags and automations. If you select the status Rejected the automation adds a tag and close the ticket. If you wish to see in the ticket list view you could have a field that is set or change the subject of the ticket to have the word rejected in the start of it. If you have haven’t set a item category you could use that as well. Ordered Approved or Rejected.