[Fizzlemizz]

Edit: It appears to work as expected in Legion beta but not 6.2.4.

I agree you should but, explicitly setting "*type1", "*type2" to nil or "assist" I still get left/target, right/popup.

I was under the impression they actually had to be explicitly set before the buttons did anything but I see:

function SecureUnitButton_OnLoad(self, unit, menufunc)
    self:SetAttribute("*type1", "target");
    self:SetAttribute("*type2", "menu");
    self:SetAttribute("unit", unit);
    self.menu = menufunc;
end