1. For moving automation points in a controlled way, you can use commands :
Nudge Up/Nudge Down & Nudge Up Fine/Nudge Down Fine
It works particularly well, when these commands are assigned keyboard shortcuts. Just select the automation points you wanna move and use these commands. Alternatively, while moving the automation points with a mouse, you could hold [Shift] modifier key to move the points in smaller increments and in a much controlled way.
2. For applying same automation to multiple tracks at once, the best way to do it would be through VCA automation. Just select all the channels that you want the same automation applied to and create a VCA channel for those selected channels. Write your automation to the VCA channel and all the other channels will follow suit with it. Once, you are happy with the automation and ready to commit, simply right click on VCA channel and select "Merge VCA Automation". That will write the VCA automation to those individual channels.
Hope this helps.