YES. In the fully licensed version, all objects that PlaceMaker imports can be edited.
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!
In the TRIAL version only, the objects that PlaceMaker imports can not be edited unless you are using the special trial tutorial model.