For your convenience, you have the ability to start an application and finish it at a later time.
The following stocks are listed on the Reg-SHO watch list. Reg-SHO is a US regulation governing stock shortability. In general, Reg-SHO restricted stocks are not permitted for shorting. However, IB may allow Reg-SHO stocks to be shorted when inventory conditions permit. The main shortable list defines the actual availability.
Please see following web page from the NYSE for additional information: http://www.nyse.com/threshold/ regarding Reg SHO and restricted stocks.