You might want to try the "Open Command Shell" AddIn (See AddIns forum...) It will put a button on the toolbar that opens a command shell in your project directory so you can run it outside the IDE... also there is a command line flags option in Projects->Options->General that lets you set command line parameters when test running the app.
AddIns are very easy to install... just drop the appropriate DLL (32 or 64 bit per your OS) into the Pelles C/Bin/AddIns folder... then launch POIDE and under Tools->Configure->AddIns, enable it by checking the box next to it.