To enter Rust commands, simply tap F1 to open the console, and type in the command you wish to use. In the case of "true/false" commands, simply type either true or false as the command, without ...
The RLS provides a server that runs in the background, providing IDEs, editors, and other tools with information about Rust programs. It supports functionality such as 'goto definition', symbol search ...
The Rust server can be taxing on your host/local machine but maybe not as much as you might think. As a baseline a 3 square km (default gen size) map freshly generated will run at close to 2 gigabytes ...