Mike,
When adding nodes at either end of a selected range on a track, start by shift+clicking the envelope you want to add the nodes to.
Swipe in the bottom have of the track to select a range (swipe by left click and drag).
Hover at the top of the track until you get the new mouse pointer icon and then drag up or down. 2 envelope nodes will be added at either end of the selected range.
This always works for me.
To copy track and bus automation, select the track or range... click ctrl+alt+c... select track and bus automation only... uncheck others
move to the track you want to paste it too...
ctrl+v
It will paste from the Now Time forward, so make sure you RTZ before selecting and copying and then before pasting to get all the automation for a given track.
I'm not really a great midi resource, so I'll let others handle #3.