Ok... im posting this in the name of evolution. I apologize in advance if this little item has already been brought to your attention.
So lets suppose we have a device that is either new or was not configured for snmp previously and now you would like to enable this configuration.

Via the desktop gui we are now re-directed to the web interface. Ok so below shows the web interface. I would expect to see some instruction here.

It is in no way obvious how to configure this device for snmp. If you un-check the icmp only check box your menu will be updated dynamically. as seen below:

This is an easy web interface fix that i hope gets addressed.