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I'm going to say that I would very much like to have a way to delete a lease from the web interface.  I know it's not the intended use case, but I use Opnsense as a frontend as DHCP server for a school of 500 students.  As others have said, there are times when it's really useful to delete a lease.   For the time being, I've been using the following script to remove leases from a command prompt 

Code Select Expand

#!/bin/bash

removeLease()
{
        if [ "${1}" == "" ]
        then
                echo -e "\nPlease supply the IP of the lease you want to remove"
                echo -e "\tex: rm_lease.sh <IP>\n"
                return 10
        fi
        echo "Remove IP: ${1}"
        if [ "`cat /var/db/dnsmasq.leases | egrep ${1}`" != "" ]
        then
                echo -e "Found lease for: ${1}\n"
                service dnsmasq stop
                sleep 1
                cat /var/db/dnsmasq.leases | egrep -v ${1} > /tmp/dnsmasq.leases
                cp /tmp/dnsmasq.leases /var/db/dnsmasq.leases
                service dnsmasq start
                if [ "`cat /var/db/dnsmasq.leases | egrep ${1}`" == "" ]
                then
                        echo -e "\nRemoved lease: ${1}\n"
                fi
        else
                echo -e "No lease for ${1} found\n"
        fi
}

removeLease ${1}