This topic was already discussed last year when we were told that it is not a top priority.
I really can not understand how can any long-short algorithm be accepted for the fund when the quantitative inaccuracy of its short positions is going to be substantial. Just yesterday I observed one of the stocks from QTradebleStocksUS() universe - the one used for the contest - have a borrow rate of 23%. The stock in question is SRNE and 23% borrow fee is a huge headwind the algorithm will face in the real world - the other ones being short liquidity, short sale restriction and other rules. These are hard to model, so at least some way to assign 'a short sale fee' would be a good start.