@t7support Not sure if any broker charges reduced for long options as the entire premium needs to be paid. It is mainly going to affect the traditional brokers who send money to the exchange on the settlement day, there you can buy option and then pay at the EOD or early next day. But now this will be also monitored.
@THE_BIGG_MART As of now the regulation is only for the index derivatives. So expect the NIFTY lot size to increase from 25 to 60-75. (I think it will be fixed at 75 for now - back to old days). Stock derivatives have no impact as of now.