Hello!! AoE3 Family, Help needed!!

Hey AoE3 family, I'm playing Aoe3 for the last six months and now I'm thinking of making my own custom scenario... In this respect, I have few unanswered Questions...The list is long so please bear with me..

1) Can we create or mod our own new sets of animals like mammoth, Titan-boa etc?

2) Secondly, can we make our own unique Heroic Units, like a king and a Queen, or commander in chief?

3) Thirdly can we create/Mod our own Unique buildings like for eg a scientific laboratory?

4) Fourth can we create our own trees and other naturally things like roses plants or Mighty Oak trees?

5) How can we zoom out to a large extent?

6)Sixth but not the least...How can we increase the map size to create a mega Map?

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Thanks in advance.

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