I'm not sure this is an active project any more as there are so many bugs and nothing being acknowledged.
This is not real integration of PS into VS, it's integration of PowerGUI editor control into VS which means many VS features do not work such as search and VS outlining (power GUI outlining not compatible) and even the context menus dont provide the same
VS functionality as all other project types, i.e. cannot delete files, copying folder directories into a power shell project results in errors and source control integration is not robust.
I suggest you redo the editor portion and have it utilise the VS text editor. The project also should support basic features such as deleting files.
Overall rather flaky, MS should have build in support years ago! jokers!