Please give me advice.
1 - Is it possible to write personal easing effect?
2 - Is it possible to change collapse effect at form, windows,trees and other component?
Animation effects have been completely rewritten in Ext 4. They will be able to "target" either ordinary DOM elements, or Components like forms, windows, tree etc.
If you want to animate Components, I'd say wait for Ext 4, and don't waste too much personal effort on it.