Trim / Split - Polygon Tool - Problem

Trim / Split - Polygon Tool Help

With the Trim / Split tool in polygon mode you can lock the view cube, but you can’t unlock the view cube anymore - is this intentional ?

After executing the Trim / Split function (Polygon) 2 Finger Tap UNDO does not work (UNDO only possible with arrow button).

Is it possible to execute the UNDO function after Trim / Split in polygon mode without deleting the polygon points to add points afterwards ? If you execute UNDO the created polygon for trim / split is always completely gone / deleted. With the Tube Tool you can also execute the UNDO function after validation and then change the points again.