A very nice feature to add would be to include a new "Generate PSK" button in the Zabbix host configuration screen that would fill in the PSK field.

 

Wouldn't be too much of a hassle to add a button like here:

 

Perhaps even consider:

• Generating a random PSK identity.
• Using the hostname as the PSK identity upon clicking generate PSK button.

 

Great feature to add, that can be sold as "increases security" by randomizing PSK's right in the frontend.