Jason, i don't think that works. what i got to work was the following (on v11.0)
virtual-servers add { my_vs_name1 { destination 5.5.5.5:8080 } my_vs_name2 { destination 5.5.5.6:8080 }}
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virtual-servers add { my_vs_name1 { destination 5.5.5.5:8080 } my_vs_name2 { destination 5.5.5.6:8080 }}