...Or at least an option to continue receiving this data.

I see four ways to implement this:

1. Add a new input port on mouse or keyboard related nodes (such as Receive Mouse Moves) with a boolean value for allowing the data to continue being received by the composition;
2. Add a new input port on a window related node with a boolean value for allowing the application window to continue allowing mouse or keyboard data to be received by the composition;
3. Create a vuo.window node that allows a composer to set this behaviour for an application window; or
4. Create separate mouse or keyboard nodes that will continue to send this data regardless of whether the composition is the active application.

I see 3 as the best option, as it would not require the addition of new nodes or the addition of new ports on existing nodes, but rather a single new node that would plug into a window node in the same way that Change Fullscreen Status and related nodes already work.

In addition, a way to further extend this idea is to also allow the composer to control whether this would also apply if the window were minimized, or if the application were hidden. These properties could be implemented on the same vuo.window node.