No, I don't think you can copy and paste the values into a list, although that would be a neat feature.  I remember that you could do this in the repository for a drop down list.

For Cloud, you cloud create a database, and a lookup rule and use the lookup rule to populate your radio button, check list or drop down list.  Then, to create or update your database you could copy and paste your list items into Excel (which should put each item into it's own row) and import that into the data manager.

This approach also has the benefit because the database and lookup rule can be re-used in other forms.

Hope this helps.