You could code something with the help of mouse_ent and switch off the objects physics, moving it depending the mouse_force.x/.y while holding the mouse button, and, when releasing the mouse button, switching on the physics of the object and applying the move as forces...

http://www.puppenheim.org/
http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt