Thanks Koen. We'll get this in front of the right people.
For those not familiar with the setting, it was adjusted from 0-5 to 0-16 starting in version 6.1.3.2. The 0-5 levels map to the 0-16 levels as shown below; 0-3 have the same effect. However, keep in mind, this is a setting that you should only use when there is extreme network degredation due to non-wifi interference. It reduces coverage size and max throughput. Also, legacy APs (12x and ealier) will only change behavior with levels 0-3 and 13-14. Consult TAC if you have specific questions.