The most recent iteration installed does in fact have a wall mounted removable remote control. About 5cm by 30 cm. I can only imagine how much fun it would be to stand outside the door with one of those causing shrieks of terror as I alternately dial up jets of ice and warm water on the posterior of my unsuspecting victim.
Mine came with a wall mounted remote control - which is in fact actually wireless - but thankfully it uses infrared so it's line-of-sight only!
The autoflushers are the worst though - the ones in the ANA Lounge at NRT flush for me at least three times during the process of getting in, out and actually performing in the cubicle.