max_items in PEP plugin of pubsub module

I am trying to use PEP plugin to store bookmarks and retrieve them later. Problem is that i am able to store only one bookmark because max_items is hard coded to 1 in node_pep module.
1) Is there any reason why it is hard coded to one ?
2) How can i set set max_items for node plugins via configuration ?

Thanks,
Girdhar

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