Front-end conditional logic
Front-end conditional logic so the user can sort and filter based on their own needs, and then save that view.
The search function needs to support conditional logic or chained selects. Search by Manufacturer -> Model -> Package.... or... Country-> State/Province.
+1 for this, although for my own user base, I would want to limit the entries available (e.g. created by my user group / organisation) before I let the users sort and filter the sub-set of entries available to them.
In other words, two levels of filter would be needed - one set by the administrator when creating the view and one for the users who can manipulate the entries that they are allowed to see.