Setting the HiddenInput attribute on derviced type should honor the value of DisplayValue instead of just the fact that [HiddenInput] is applied since HiddenInput is Inherits = true. for example:
 
classA {
[HiddenInput]
[JqGridColumnEditable(true)]
PropertyA
}
 
classB : classA {
[HiddenInput(DisplayValue=true)]
[JqGridColumnEditable(true)]
override PropertyA
}
 
when generating the js using the helper<classB>, the code above should generate classB.PropertyA configured to show in edit template