Hi there,
If the ONLY thing you change are adding syslog, NTP, TACACS and SNMPv3 (not removing any existing ones - one of the snmp communities is needed for cluster switch health monitoring by ONTAP), you would remain within support. On the unlikely event that you open a support case and they refuse to work on it on the basis of those additions, refer to this post 🙂
We provide internal documentation on setting up TACACS for the BES and CN1610 switches, which involves additional configuration stanzas not present in the RCF, so it will be supported on the cisco too.
The statement that changing the RCF by modifying switchport configurations, connecting to existing networks etc remains 100% correct.
Hope this helps!