2) To disable automount in udev rules.
I don't understand udev at all, and couldn't locate the actual
lines that I should comment out.
Create the file
/etc/udev/rules.d/10-no-automount.rules
and in it put the line
ACTION="add|change", subsystem=="block", ENV{UDISKS_AUTOMOUNT_HINT}="never"
No need to reboot as it takes effect immediately.
Before doing this you will have read udisks(7) and know why it may not
work. You may also want to investigate changing the udev rule to see the
effect of UDISKS_PRESENTATION_HIDE.