I know this is old, but for the benefit of anyone looking for the Modify Sketch Vertices tool the GUID / ProjID is:
{A4AF2F51-8365-4122-8B04-638413E6510E} / esriEditor.EditToolEditSketchCommand
The GUID / ProjID for the Edit Vertices button on the Editor toolbar is:
{D0F62794-98C4-447A-A0B2-4ECDB6554FC9} / esriEditor.FeatureEditVerticesCommand
I am still looking for the GUID / ProjID of the Flip command under the Editor category, which is described as:
Flip
Change the direction of the sketch. The first point added to the sketch becomes the last point.
Edit: I found out the ProgID for Flip is simply esriEditor.FlipCommand. I came up with that by trial and error, and I did not try to get the GUID, since I am not working on an ArcObjects program/add-in, only a Python Add-in, which just needed the ProjID. But ArcObjects users can find the GUID through the ProjID.