Hi, in the Rhino 8 WIP there is a new “Auto CPlane” button the status bar. This ties your CPlane to your selection.
Here’s an example:
For planar surfaces this should quickly allow you to put down a curve. Then using split, joining the two pieces, and gumball extrude you can get pretty close to Sketchups push pull.
Here’s some more information on the Auto CPlane.
https://docs.mcneel.com/rhino/8/help/en-us/index.htm#commands/autoaligncplane.htm
If that isn’t quite what you’re looking for there is a test command I wrote called TestPushPull. It won’t show up in the auto complete as you type it since it’s hidden. This test command emulates SketchUps push pull.
Be aware, it is a test command so no guarantees!