capacity required for Ultimate Branding Custom Dashboard Welcome

I use Ultimate Branding which is a very nice plugin, and have just one issue with the Custom Dashboard Welcome.

I have activated the Custom Dashboard Welcome and it displays fine.

I use another plugin, User Role Editor, to manage capacities of my WP users.

When I create a user with role 'role1', when he connects for the first time to WP admin, the Custom Dashboard Welcome is not displayed, but in screen options, a "welcome" check box is available, and when the checkbox is checked, the Custom Dashboard Welcome is displayed.

Howerver, when I create a user with role 'role2', when he connects for the first time to WP admin, the Custom Dashboard Welcome is not displayed, but in screen options, there is no "welcome" check box available, so the Custom Dashboard Welcome is never displayed.

Of course 'role1' and 'role2' have different capacities. My questions:
What are the specific capacities required to have this checkbox displayed?
Is there a way to have the Custom Dashboard Welcome displayed by default?