I have modified my 4+ year old GS/3 running software rev. 1.11. I have been planing to do this since Steaming with La Marzocco GS3 - better late than never
I'll never use the tea water and don't like the way the wand restricts the access to the control buttons, so I removed the system completely.
I then reused the solenoid and the electronics from the tea water system to control the steam And I have now replaced the lever control with a supplementary steam button.
Precisely as hoped for the steam wand now drains much faster - and with lot less water coming out Using the build in tea water system to control the steam, I now have timed steaming
For the time being the timer is set for a max filled pitcher and if it wasn't for the video I would manually have stopped the steaming a few seconds earlier with this amount of milk.