So guys...you know what might be a killer app here?
Take this stencil with its shapes. Have each shape reference a
SystemC module with behavior. Have the connection lines reference a SystemC interface module (could be a simple as name match up.)
Have the page/template have the overall SystemC framework (maybe a dashboard on simulation time length, start/stop, single step, etc)
From there you could provide all the system C source that could be plugged into in a SystemC simulator....or even reference/launch/include the simulator (and use text file for the output info.)
Make this a Visio add on...could post to SystemC org site as well as Visio tools....etc.
End result.....Visio as a GUI front end to
SystemC simulator.
And of course from there...could get into something similar for system performance tools such as MVA
(very simple approach to measure system performance...good accuracy but none of the esoteric math purists love).
Just a thought