Comment on BTST/ATST( Buy/Acquire Today Sell tomorrow)
1. Try to be in the top 200 stocks. Check this list.
2. Delivery
3. Exchange delivers around this time, so not possible before unless the seller is also a Zerodha client (internal adjustment).
4. Yes DP charges on BTST also, as the shares credit is taken into demat for BTST as well.
5. I guess you mean, after selling shares it shows negative value. Negative margin blocked value is like positive margin to buy stocks.
6. IT will be considered delivery if you hold it for overnight.