When the cabin is reported to be secure we switch the autobrakes to RTO and press the T/O config button.
Sorry just playing devil's advocate here, so when the cabin omit to give you secure you omit to select RTO and press the T/O config button......
We use the inop No Smoking sign switch as a reminder
For my money this is one of the simplest and makes use of a redundant switch!
Cabin secure, switch "ON" (down), cabin released, switch "OFF" (up)