The VRCS1 is a remote scene controller, and as you have inferred, it will not directly control a load. It can be programmed to control a load from a remote location (similar to a 3-way application). In order for the VRCS1 to control your outdoor lights, a Vizia RF+ switch would need to be installed, in place of switch currently controlling the lights, and then paired, via a programming remote or computer software, to your VRCS1.
For example, the VRS15-1LZ is a load-bearing switch, and would replace whatever switch is controlling your outdoor lights. Your VRCS1, which may be installed in a second location, could be programmed to control the VRS15, without actually running new wiring down to the VRS15.
When pairing the VRCS1 to the remote, you need to first open the switch cover, and then, in one motion, push close the door, and continue to push and hold the switch in for about ten seconds. At this point you should choose to "INCLUDE CONTROLLER" on your remote.