For example, on a graph showing all cpu cores, it would be possible to only print out the "All Processors" value instead of filling up the graph with four or more values. In general it would allow there to be more than a few monitors on one graph, while narrowing down the text output to the particular devices the user deems most important. In this form, it could be a checkbox somewhere in the device's settings window. Another, more complex option would be to allow users advanced control over which values are chosen to be shown (show only the highest cpu core, hide network monitors that are zero, etc). However this would be implemented, it could perhaps fit well in the same configuration area as https://bugzilla.xfce.org/show_bug.cgi?id=14099.
OK, I'll stick with the simple implementation of being able to disable addition to text overlay on a per-monitor basis. I'll get this done for this version. The other suggestion is way too advanced, monitors need to be sufficiently generic and separated as a design concern, so I'll be suspicious of anything that tries to group them together in strange ways/processes them as some sort of higher unit. There is already too much CPU wastage coping with different monitor type maxes in one visualisation when you max out the plugin size (despite the fact its only looping over only a few things 10 times a second and in C++??), so I don't really want to add further bloat here.
Have now pushed the ability to remove a monitor from the text overlay. They're all on by default currently.
Resolving as the new version has finally been released.