Add buffers (i.e. as a signal) + Arrow on chart on an indicator. buffer should be reliable levels when called from an EA (iCustom)

Hello,

i have an indicator drawing Supply and Demand zones on chart and i would like the coder to implement the following :

1. Add 2 buffers (i.e. as a signal) for when price is "In a zone"; + Arrow on chart on the corresponding candle
2. Add 2 buffers (i.e. as a signal) for when price is  "Exiting a zone" + Arrow on chart on the corresponding candle
3. Possibility to turn ON/OFF the Arrow in the input settings
4. Add 2 buffers for the current zone levels (Supply high/low price and Demand Zone high/low price ) when price is in that zone or exiting that zone
5. Optimise the code for fast update and reliable buffer levels when called from an EA (iCustom)
6. Alerts and pops should default to "off" (preferable when calling from an EA)

BUY signal and UP arrow in demand Zone

Sell signal and Down arrow in supply zone

NOtE: buffers must work properly because i am going to backtest it. 

File to deliver should be the source code file ".mq4"