Customizing RPC provider

[Sumant Padbidri]

Are there any hooks available to customize how the RPC provider gets the
target service object? Instead of simply instantiating an instance of the
classname I'd like to retrieve an instance from an object pool or factory.
Do I have to write a new provider for that? If so, how can I specify a
custom provider in my WSDD?

Thanks,
Sumant