Give a customer ticket the option to have the priority be required (Not none) or chosen on creation

We use customer tickets for escalated issues and we have different SLAs for different priorities. The only issue is that when escalating, choosing a priority is an extra step and cannot be a required when creating a customer ticket so often people forget to change the priority. This is causing many tickets to be viewed as priority None when they may need to be looked at sooner rather than later.