Is it possible to dump rosparam when the node stops using roslaunch?

On the wiki it is stated, that "dump" and "delete" commands run before load, which is exactly opposite from what I want.

Currently I do it manually like this:

void dumpRooms(std::string yamlFile) {  
   system("rosparam dump -v "+yamlFile.c_str()+" my_namespace"); 
}