MODO | Topology Pen Tool Shortcuts
greentooth
The Topology Pen tool can be found in the Polygon tools menu in the Model Layout, and the Tools menu in the Topology Layout. Whether you're using the Topology Pen tool for retopology or other modeling tasks, you'll want to take advantage of the shortcuts that are available. This quick video shows the various shortcuts available.
http://www.pixelfondue.com/blog/2017/3/26/modo-topology-pen-tool-shortcuts