Even if you were able to short SSF, why would you when its underlying refuses to go down due to the ban? Remember that the tail can't wag the dog!
Single stock futures suffer in liquidity because Wall Street has refused to promote SSF's. The IB's have made big $$ charging usurous interest rates for lending out stocks to shorts. As they make soo much cash on those loans, they've had no interest in promoting trade in SSF. This sillly shorting ban should draw more interest and liquidity to SSF's and hopefully, this market will do better. It should. SSF's already do well in Europe and this is a great instrument.
I dont think the OP understands futures at all. SSFs ARE ZERO SUM GAMES. If you couldn't sell/short them then you couldn't go long and the whole system would collapse... next