Control number of listed topics when using Tabs widget

When using the Tabs widget, it would be helpful to have control over the number of discussion topics listed in a tab before the "show more activity" button. We can work around this with custom code but it would be great to have a simple control in the UI for the widget.

You can accomplish a similar layout using the Dynamic Content widget, which does expose controls for number of items to display, but that doesn’t allow for the tab-based functionality.