EA based on volatility / mean reversion

I would like to implement a fairly simple EA with the following features:

- the ability to calculate an average from the volatility of the previous weekdays (e.g. the last 8 Tuesdays, NOT the previous 8 trading days).
- trading sessions (Asia, Europe, USA) must be able to be defined
- Times in which the EA is allowed to trade must be able to be defined
- basic abilities to visualize trading periods in the chart with the help of rectangles and price data with lines
- basic capabilities to open a trade with a certain position size
- definition of how many trades the EA is allowed to open per defined trading time