Over my last 600 or so short trades I’ve gotten average cost of 0.00021 (0.021%) of purchased/sold value round trip.
Interestingly, opening the trades costing around 0.012% of trade value (0.480 of a cent per share by volume) and closing them just 0.009% of trade value (0.335 of a cent per share by volume) .
Yeah red dot is short sale restriction. I have never found this to be an issue though. Usually because the short sale restriction only comes into effect after the price has already dumped somewhat within the trading session. By that time, you have already gotten your short trade on so whilst no further short selling is allowed, your short position is already filled and will still be allowed to be closed/covered.