Should patrons be required to order an entree plus one?
Is a milkshake really a drink or is it a dessert?
Would you go to a restaurant at home and just order a milk shake? The only place I might do that is an ice cream place like Friendly's. Other than that, I would never do that but that is just my opinion. Maybe split some appetizers and get a drink (shake)???
I don't think anyone has mentioned this possibility yet - how about just having a seat at the bar and ordering your milkshakes there?
I realize it's not exactly the same atmosphere as the restaurant, but I hear the bartenders are a lot of fun, and that way you wouldn't have any issues about taking up a table.