Option to display random callout from active set (rather than only if there are no related terms).

First, thanks for putting forth the effort to develop and maintain this module, as it has been useful on several projects thus far. However, there is one feature that is sort-of implemented that would be incredibly useful: randomized blocks from the active set of related terms.

Currently you can display all related callouts (up to a specified maximum) OR a random block if the active page has no related callouts or does not have any terms defined. Would it be possible to add another configuration option to display a random callout item on pages that DO have taxonomy terms defined? That is, instead of displaying all of the related callouts, display only one callout but choose a new one every page refresh?

The primary motivation for this feature is to serve as a simple banner system. For example: there are two content pages, Home and About, each of which has a unique taxonomy term assigned to it. There are also four blocks, two of which share the taxonomy terms with Home and two of which share with About. Currently you could display either two callouts on each page (if the maximum setting allowed for more than one), or a random callout from the entire set of four. With my proposed configuration, you could display a random callout from the two assigned to Home, and another random callout from the two assigned to About, but you would still never see the About callouts on Home (or vice versa).