For 802.11k enabling option ieee80211k '1' enables reporting of things to the devices like channel utilization and how many clients are on the AP.
option rrm_neighbor_report '1' turn on the ability for each AP to give a list of nearby other AP's to roam to the device so the device can scan faster. If you only have AP, this would be pointless.
You have to populate the neighbor report manually or with scripts that are available. In my case, I have 3 AP's and I just set the neighbor report manually in startup and check every 5 minutes in a cronjob to make sure the list is still there because any changes or restarts deletes the list.
I don't use 802.11v, beacon reporting (option rrm_beacon_report '0'), DAWN, or usteer so I don't have any info on that but I do use 802.11r (fast transition roaming)