When submitting a new ticket, requester can have the option to change the Urgency, Impact or Priority level.
Why isn't it possible via a Service Catalog item? Priority can be set afterwards with workflow automator, or the requester can also change it AFTER he submitted the request, but allowing the requester to choose the Priority level at request creation directly would be very useful.
Second this. It is a common request from our clients and I don't see an option to activate this by default.