YES. All objects that PlaceMaker imports can be edited using the built-in SketchUp tools. For the Revit version, the imported objects are also editable.
During import, PlaceMaker performs a huge amount of clean-up and optimization on the data so that it can be easily edited with the standard SketchUp tools. We even fix skewed corners of buildings so that they are 90 degrees and can be modified using the Push / Pull tool!