sudo ./lstconfig EnableChannelSelect true

Value names are case-sensitive.
Global Teacher Settings
The following are a list of global settings that can be changed:
AlertOnUpdate true/false
AllowAudio 0/1
AllowDumpUploads 0/1
AllowInternetMonitoring 0/1
AllowKeyboardMonitoring 0/1
AllowTaskmanLimiting 0/1
Authorization This is not a password, but an integer password hash.
ClassroomServerAddress Address/hostname and port of Classroom Server (ie 10.16.2.4:8080)
DisableDataTransmission true/false
EnableChannelSelect true/false
NoRegistration true/false
OneToOne 0/1
RelayServerAddress Address/hostname and port of Relay Server (ie 71.70.1.15:8081)
SecureMode 0/1
StealthMode 0/1
UseLegacyScreenGrabber true/false
Teacher Settings
The following are a list of teacher-specific settings that can be changed:
channels List of channels. Maximum 64. Each channel must be between 1 and 16000.
limitTaskManager true/false
logLevel 0/1
subnets List of IP addresses. Minimum 1, maximum 3
transport 0 = broadcast, 1 = multicast, 2 = directed bcast
useSingleChannel true/false

The Teacher Console should not be running when configuring settings.
The following are a list of Teacher settings are only used when the teacher "Becomes a Student" or updates a computer running the LanSchool Student:
AllowInternetMonitoring
AllowKeyboardMonitoring
Authorization
ClassroomServerAddress
OneToOne
RelayServerAddress
SecureMode
StealthMode
After the change in settings are made, you will need to clear the preferences cache for the user. This can be done either by rebooting/logout, or by running: killall -u <user> cfprefsd