I checked with a zPDT/RD&T expert. This was his response.
Are they interested in "real" tape library (using SCSI tape drives) or an emulated library of awstape volumes? Regardless, the base zPDT technology nothing to offer. In general, tape scratch pool automation is, in a sense, an application --- typical of production operations, not development operations. There has been interest from customers in an emulated (or SCSI) automatic tape library system, similar to the tape libraries that IBM sells. However, this is not on the roadmap.
alisalm