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Publishing to only one Subscriber by load balancing

Dear administrator,
I am learning IceStorm recently .It's useful.But when i apply it to my project,i run into problems.
In my project ,a app publishes an event,which can be consumed by olny one subscriber.Otherwise,the same kind of subscriber would consum repeatedly.If i only register one subscriber node, it would overload the node.
I view the code of Icestorm,it has a vector of subscribers,and publishes form the beginning to the end of the vector. If subscribers specify they are the same kind, Can icestorm publish to only one subscriber by load balancing ?
Forgive my poor English...:o