Entity is not validated prior to being saved
Invalid values can be submitted.
Issues
Add a "Prepend to the current value" to the "Modify field values" action
Add an option to prepend values. Currently only append is supported.
Add action to delete specific field values
Bulk remove specific values (from multiple input field?).
Allow user selectable form mode for bulk edits
Currently hardcoded to use bulk_edit display mode.
Current dev version broken - saves all fields even if only one changed
Only changed entities should get saved.
Save button on each row
Add a save button to each row.
Modules
Views Bulk Edit
Modify field values action, compatible with VBO and core views actions.
Bulk select items in a view, then provide a field value to set on all items.
Bulk Update Fields
Provides an action to bulk update field content.
The UI for editing takes a few clicks, would be great if it could be simplified.
Views Entity Form Field
Edit fields in views.