Hi Peter,
Like i mentioned in the other post, it really depends on the customer's error requirements. If you have a limited operational temperature range (0 to 50 degrees C) and can accept 1-2 dB of error at 1pA, then I would say it is suitable at 1 pA input current. However, if you need a larger temp range and/or less error, then it probably will not work for you. I would advise studying the Typical Performance Characteristic plots that start on page 7.
Thanks,
Joel