A primary goal of this plugin is to prevent section editors from creating or editing published content unless they are explicitly allowed to do so. As a result the default capability set is quite restrictive.
The BU Versions plugin compliments this functionality by adding a workflow that permits section editors and other less capable roles to create “Alternate Versions” of published content, allowing them to make modifications that are not publicly visible which can then be submitted for review by users with greater privilege.
Additionally, it is possible to modify the default capabilities for the section editor role programmatically or by using a plugin such as Members. More details on how you could go about this available in the Github Wiki.