ENHANCING AN EXISTING EXPERT ADVISOR

I need an improvement in an existing EA and the script  with link below

https://www.mql5.com/en/code/21697 

 XIT THREE MA CROSS.

1. I NEED TO MAINTAIN EXISTING FUNCTIONALITIES 100% BUT 

2. INCLUDE ADX CROSSES CONDITION FOR OPENING A BUY OR SELL POSITION

          IN THE ADX CRITERIA FOR OPENING A POSITION - SHOW A PARAMETER FOR +D LEVEL(MINIMUM BEFORE OPENING A TRADE)

           AND -D LEVEL (MINIMUM BEFORE OPENING A TRADE)

4. ADD CRITERIA FOR MOMENTUM - TO INCLUDE MINIMUM LEVEL FOR MOMENTUM BEFORE EXECUTING A BUY OR SELL POSITION 

          FOR A SELL OPEN POSITION, MOMENTUM MUST BE BELOW THIS LEVEL

          FOR A BUY OPEN POSITION MOMENTUM MUST BE ABOVE THIS LEVEL

5. PLEASE INCLUDE TRAILING STOP 

PLEASE NOTE THAT THIS MODIFICTION IS TO IMPROVE THE EA. PLEASE DONT CHANGE THE EXISTING FUNCTION.