Use Managed Property as scope in search drop down

Hello,

I've built a ticket system using sharepoint 2010 and infopath. Now I'm configuring the search and I have a problem with one scope. My aim is to let the people search by the ticket id. The ticket id is equal to the item id. The Scope should be chosen in the upper right dropdown besides the search input box (see picture)

I've created a Managed Property for the ticket ID and I've mapped it to ows_ID. Now, if I create a scope and add a rule and select "Property Query" as Scope Rule Type, then I've to enter the property restriction. In my case that's a Ticket ID. But I don't want to limit the search to a given ID, I want to search over all IDs, that are according to the managed property (Ticket ID).

Is there a (simple) way, to use my managed property as scope in the scopes dropdown?

Or is the only possibility to use the advanced search webpart to search for a specific Ticket ID?

Regards

Simon