If you do not see the 2 roles 'IDS Alerts' and 'Security events' from your dashboard, then you cannot leverage them in the API as roles. I am able to use the Security events role in my syslog settings through the API across several branch locations for one of my clients, all which consist of combined networks (wireless/switch/security). It is unusual that 'Security events' is not a selectable role, so I would open a case with Meraki support to have them check out what could be going on; I am unsure on the 'IDS alerts' role as I've never seen that as an option in the dashboard, and in the current API library, I do not see that as a role option either.
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