SNMP query (e.g., with snmpwalk command) on VSX OID branch 1.3.6.1.4.1.2620.1.16 for Virtual Systems (other than VS0) returns 0.
Example:
.1.3.6.1.4.1.2620.1.16.23.1.1.2.1.0 = INTEGER: 50 .1.3.6.1.4.1.2620.1.16.23.1.1.2.2.0 = INTEGER: 0 .1.3.6.1.4.1.2620.1.16.23.1.1.2.3.0 = INTEGER: 0
This feature is disabled by default in VSX R77.10 / R77.20.