i think that there two systems available. one that makes the brake light flash, instead of creating constant light, and the second more sophisticated is that that brake light comes in with flashing or not when you decelerate. pressing the brake lever gently to warn the cars behind is another option, but I am often just not thinking of it, so prefer that the module does it for me. I also often forget to turn the turn signal on. there is also a turn signal module to do it for you, as in the higher end bikes (my Tiger has it), but the wiring of that thing is very complicated, so don't bother. I prefer to have the least electronics possible on my bikes, and prefer not to cut any wires.
as you love riding, you need to love you bike