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It would be ugly but you could drop another launch file alongside this one:
/opt/ros/jade/share/usb_cam/launch/usb_cam-test.launch
And then roslaunch usb_cam usb_cam.launch.
https://github.com/bosch-ros-pkg/usb_cam/blob/develop/launch/usb_cam-test.launch
But really you should have a catkin package that contains your custom usb_cam.launch like catkin_ws/src/my_package/launch/usb_cam.launch, and then make sure to fill in the CMake commands to get it get installed if you are sourcing catkin_ws/install/setup.bash instead of devel/setup.bash, and then roslaunch my_package usb_cam.launch should work.
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