Short Sale Rebates

Does C2 calculate short interest rebates on shorted positions?
If short shares are no longer available after a position is taken, how does C2 handle this - if at all?
Arbi

We do not include the borrow costs for short sales, nor borrow availability. These both vary by broker. These factors can be material for strategies that depend on shorting hard-to-borrow shares, and so this is something I’d like to add in the future.