If you seriously imagine most or even any car drivers are going to notice hand signals, let alone know what they mean, you must be living in a parallel universe where all other road users are trained and licensed by bikers.
Or you have a death wish.
Or you're simply a whacky dreamer dangerously detached from reality.
As for wiring them so they're permanently on - see above.
Pretty good rant. As you added name calling into your rant it should be worth at least 3 extra points, but I'll let ace.cafe make the decision as to actual score.
Here in the U.S. of A. turn signals on autos were not all that common as standard equipment from the factory until the very early 50s. My 50 Stude or 40 Ford does not posess them. Sure a 39 Buick or Cad or Packard had them but certinally not common. I believe most had them by 1953. When I started riding on the road more than 50 years ago there were few cars with turnsignals. Bikes? Seems it was not until the later 70s that they were 'mandated' for all two wheelers. Maybe earlier, but you get the point. There were a lot of years that car drivers were useing flashers and bikers were useing hand signals and were sharing the same road. You may be 100% correct that few drivers, nowadays, would recognise a hand signal. But I have my reservations based on the fact that I've never owned a bike, until I bought the Bullet, that had flashers. Have never used them. Honest, I really believe that IN DAYLIGHT hand signals are better. If a person really believed that hand signals were safer to use at night he could properly be considered a whacky dreamer.
In my estimation the only signalling device on a motorcycle that the majority of car drivers will ever pay attention to would be something on the order of exploding flares or or flame thrower.