you mentioned: "You can type a list of sensor names in the process options. " It is not possible. It only let me choose one channel at a time
In the connectivity NxN processes.
What you show here is coherence 1xN.
"And you can always represent the connectivity graph as an image, in which you can zoom, click on the connections to see the actual values"
Right-click > Display as IMAGE.
How can I have rho = ?; p = ? values for statistical analysis?
These processes give you connectivity metrics.
If you want statistical significance levels, you need to compute them from these connectivity values.
https://neuroimage.usc.edu/brainstorm/Tutorials/Statistics