Map making questions.

So its been awhile since i worked on any of my maps and have a few questions on whether some features have been added or not and how to update too some of the new features.

Questions:
1. Can you have custom ground models for each map yet? i find the current mud has too much grip compared to what it used to have.
2. How do i change all the trees, bushes etc. to the new "soft" ones that use ground models?
3. Can you set custom ground models for objects? i really want to make some bog holes but can't find a realistic way to make mud, the water block doesn't have enough options to make it realistic.
Any help is appreciated.
4. how do you set up the multiple spawn points?