1) 50% of Span margin is all that is required for you to take an intraday future position. You can take a intraday nifty future position with only around 11000 in your account. If you want to keep it for overnight, then you need bring in the entire margin to hold the position( around 32000).
2) Yes, you can always call us up to place your trades. Call n Trade facility would cost 20Rs for the call.
3)Our square offs start presently at 3.15pm and looking at starting at 3.20pm very soon because of popular request. The position would be squared off to the extent you have margin to hold according to exchange set margin. So, for nifty if you have bought 9 lots of nifty with 1lk in your account, at 3.20pm, 6 lots would be squared off as the margin in your account can hold only 3 lots.
5) Yes you can link the sharekhan DP as long as you don't do any delivery based equity trading. We have put a request with the exchange to help us fasten the process of account opening. If everything is through, we will start opening trading accounts in 1hrs time from the time we receive the documents very soon. Account opening cost: Rs 300 and no other costs(amc, software etc etc)..
Cheers.... Sachin....