Here I am! 
Dezmo_select_parallel_edges.rbz (3.0 KB)
There is only a context menu and icon to start.
The icon will be grayed out and the context menu will not appear if there is no edge selected.
Therefore to be able to assign shortcut, first you must select something containing an edge(s).
The result - total number of parallel edges, including the pre-selected one(s) - will shown in a measurement area. After 5 sec will be cleared out.
If you
-start an other tool within this 5 sec,
-or you use this plugin while other tool is running
that may conflict with “measurement display” of that tool…)
If you want to change the icon, after installed. Go to
c:\Users\YOUR_USER_NAME\AppData\Roaming\SketchUp\SketchUp 20XX\SketchUp\Plugins\Dezmo_select_parallel_edges\ folder
and change the spe.png
As usual it should work, but no warranties! Use your own risk!
Report here if you have issues.
Good look!
