set value range on automation lanes like tempo track

When editing Tempo in tempo track you can set min/max value displayed.
I would love to have that on all automation lanes. i usually set my volume for speak in movies at 0. and automation edit rarely go +/-6dB. If i want to have precision to manually edit the events on that automation lane i have to enlarge it alot just for a few cm i will use on the top for those +/-6dB
i would love to be able to set like in tempo track min value=-6 max value +6 and have full use of the lane displayed.