Sorry for the late reply here.
Did a tcpdump on Zabbix 1.8 with this, and the result seems to indicate Zabbix uses JSON RPC 2.0 only:
[{"jsonrpc":"2.0","error":{"code":-32600,"message":"Invalid Request.",
+"data":"JSON-rpc version is not specified."},"id":null},{"jsonrpc":"2
+.0","error":{"code":-32600,"message":"Inval
id Request.","data":"Expacting JSON-rpc version 2.0, 1 is given ."},"i
+d":"1"},{"jsonrpc":"2.0","error":{"code":-32600,"message":"Invalid Re
+quest.","data":"Expacting JSON-rpc version 2.0, u is given ."},"id":"
+u"}
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