Guess I never heard of anyone recording scrambled channels....... until now, but I do understand why you would want to record the scrambled Fox channel's audio. These channels are a bit unique as many scrambled channels do not have unencrypted audio.
The timer records encrypted programming fine when a valid subscription card is inserted. Since the decoding occurs prior recording the transport stream, the timer sequence checks the CAS status when encryption is detected. The reasoning behind this process is most likely to prevent filling a hard drive with programming that would be considered unusable.
We will determine if this step of the timer function can be modified. If so, the change might be available on a future firmware update.