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

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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)