Regarding Question 3, it is generally a really bad idea to just disable auto trading entirely or to remove the EAs, because now the trades are not being managed at all and will have to hit either full stop loss or full take profit before they are closed. By leaving trading enabled, and leaving the EAs attached to the charts, but setting Max Open Positions = 0, then you are preventing the EA from opening any new trades, but still allowing it to manage and close out open trades based on indicators, which is often more profitable than risking a full stop loss.