1. Yes
2. Yes but manually & it can be tricky if you then alter the length of pipe
3. No, not that I am aware of
4. No, not that I am aware of
Sorry I have only been using MEP for a short while, I know it will take some practise for me to get better with it.
Attached is an isometric drain plan I did a month or so back, this does update if altered & some of the parts such as the terminal vent are not part of the MEP library, i made it myself.