OK! I just added a user’s directory for ctrldev drivers (vangelis). Just update and look for this directory:
/zynthian/zynthian-my-data/ctrldev
you can put your drivers in this directory and they wont be deleted/overwritten by updates.
Keep in mind that this direcetory has priority over the system one, so if you have a driver with the same name than the system one, the user’s version will be loaded, replacing the system version.
Regards!