I simply set up a NickelMenu action to toggle SSH. Basically, if ssh-disabled is found, rename it to ssh-enabled and reboot, if ssh-enabled is found, rename it to ssh-disabled and reboot.
Code:
menu_item : main : Toggle SSH : cmd_output : 500: quiet: test -e /mnt/onboard/.kobo/ssh-disabled
chain_failure : skip : 3
chain_success : cmd_spawn : quiet : mv /mnt/onboard/.kobo/ssh-disabled /mnt/onboard/.kobo/ssh-enabled
chain_success : dbg_toast : SSH Disabled
chain_always : skip : 2
chain_failure : cmd_spawn : quiet : mv /mnt/onboard/.kobo/ssh-enabled /mnt/onboard/.kobo/ssh-disabled
chain_success : dbg_toast : SSH Enabled
chain_always : power : reboot