Hi Ed,
The activity wall is managed by BuddyPress plugin. Our theme styles this page using the colors defined in the customizer, but do not change this feature. In that case, you’re free to use this plugin. However, please note that it hasn’t been tested or integrated (yet) with our theme. You might need to add some extra css to make it fit perfectly. However, this plugin should work correctly.
Hope this will help you.
Cheers,