1. Forex or Currency trading is allowed for Indians only on recognized stock exchanges (NSE, BSE & MCX-SX) and to trade only the rupee pairs.
So trading anything else is not really allowed legally.
2. Yes we are members of Currency Derivative Segment on NSE, BSE and MCX-SX.
3. There are talks about extending trading time for currency from the present 5 pm to until 11pm, but this might take a while.
4. Click this link for knowing the margins.
5. Check out the [Currency Derivative Modules](https://zerodha.com/varsity/module/commodities-currency-and-interest-rate-futures/) .