A number of questions about poe2 gameplay

Hi all

1. I didn't find the following gems, are they not in the game yet?
Cast when damage taken, molten armor, tempest shield and other gems for CWDT setup.

2. Now in the second act, just got ascendancy
How to insert more than 2 support gem into a skill?
Is there any requirement for this?

3. Support uncut gem level 2 and above will drop later?