MDM CE NEW UI - Needing of the "Actions" button of multi-edit links redirected from the Custom Tools and Entry Previews

The users are needing the "Actions" button to perform different tasks on items that are resulted from the redirect.

1. What is the use case for Custom Search Tool which cannot be fulfilled using the Search Menu provided with New UI ?
The users are in a need of a Custom Tool that can search items by Primary Key, where the user just selects the catalog and types in the PKs to be shown in a multi-edit screen
While this can be achieved using the standard Search Menu provided with New UI, the users cannot use the Search Menu because it's hard to search 50 particular items for example, for eachitem add a new line, select the PK attribute, select EQUALS, write in PK, etc. The users are using Excel for most of the inputs and they need to paste all the PKs at once and with a click of a button the multi-edit list should appear so they can perform differentactions for the selected items.
Example of a use case: The user enters the custom tool, selects the catalog, paste the list of PKs from Excel, clicks "Search" and then a list of items is displayed. He then selectsthe items he wants to work with and using the "Actions" menu the user runs different exports/imports on the selected items using Entry Previews or just simply view some details about the selected items.

2. Once the Custom search tool redirects to New UI Grid or New UI single edit screen, what all operations you expect business users to perform on the grid and single edit screen?
All the operations on the items that business users make are based on the Entry Previews, for example they can see details of an item structured in a well-formed table that's easy to read, they can export and import parts of items and they can checkout in a workflow based on custom logic using an Entry Preview.

3. What are you trying to achieve using Actions menu ?
With the "Actions" menu we are trying to achieve in the New UI the points 1 and 2 described above, that points are already achieved in the Old UI.