Margin requirements are defined per account and symbol. To get these values you should use either O2GTradingSettingsProvider.getMMR or O2GTradingSettingsProvider.getMargins method.
You can find the example of usage of the methods in TradingSettingsProviderSample.cs or TradingSettingsProviderSample.cpp provided with ForexConnect API:
C:\Program Files\Candleworks\ForexConnectAPI\samples\cs\WholeSample\TradingSettingsProviderSample.cs
C:\Program Files\Candleworks\ForexConnectAPI\samples\cpp\WholeSample\source\TradingSettingsProviderSample.cpp
As for including PointCost and MMR in tables, I've passed your request to the development team. May be the values will be available with the release of table manager.