the demand for Kerberos support for HTTP is currently not on a level that it would get onto the roadmap. With the technology progressing, sensors are constantly reviewed in order to determine if new features have to be added. For each PRTG release, we want to provide the most benefit for most users; we look on the demand and prioritize accordingly.
As of now, Kerberos support for HTTP has been discussed internally. "Considered" could be understood that it had a realistic chance of implementation, but as of now, other features are in much higher demand. Of course with the market ever-changing, features get re-evaluated on a regular basis.