I want to write a tutorial to describe how to make the fire direction move around on the screen (follow the cursor) but I must first find the time. Also, you will need to have at least some idea of how to work in C++ (compile a mod GameDll using the Crysis SDK).
Button controls are in the configuration file. Look in the Wiisis Manual (help folder, where you installed the mod at) to learn where it is and how it works.
IR Dot is a texture. You can use your own if you replace it. Find it in the Game/Textures.pak file.