how can i delete duplikates in 1password8 ?

Netpog

Will Mac users get the ability to tag multiple items?

You already can. You can drag multiple items on to a tag in the sidebar to apply it to all of those items. To do this, you'll need to turn on tags in the sidebar (Settings > General > Always Show in Sidebar: ✔︎ Tags) and you'll need to create the tag by applying it to one item first, so that it appears in the sidebar.

Have that user give that a try and let us know how it goes. We'll be here if you need anything.