Set gears that go off map to gmDestroy instead of collision, disable morewind for no-gravity gears, restrict application of wind to gears that are already moving and not colliding.
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}