How to modify flight parameters?

Flight parameters as take off altitude or position origin are not set. How it is the correct way to set them?

It was added the modification for initial altitude as parameter in connector node. It is possible to check it in #4 But If you need to modify another parameter to use the parameters node provides by connector method not by the plugin.

ie. To modify parameters in PX4 using px4_msgs, MAVROS or MAVLINK directly.