yes you can start disabling 802.11b datarates and 802.11g/n bpsq datarates, another advantage its that beacons change from 1mbps to 6mbps that its more efficient specially when you have multiple ssid

datarates1.jpg (25.49 KiB) Viewed 1025 times

datarates2.jpg (32.3 KiB) Viewed 1025 times

if you want to restrict more the coverage area then disable 802.11g 12mbps and 18mbps (qpsk)
and 802.11n MCS 1 2 9 10 (qpsk)