Set maximum instances for FTP polling

We are in the process of implementing our first BPEL integration involving the FTP Adapter on 10.1.2. However, it is not scaling well.
The FTP Adapter is set up to poll an FTP folder containing XML output from our sales system. Each record is in its own file. We imagine that in the event of communication disruption, the files could accumulate to several thousand fairly quickly.
The problem we are seeing when testing for this scenario is that the adapter picks up all the files at the same time and spawns a separate request for each until it overwhelms the server.
How can we change our process to prevent this from happening?

Oracle will tell you that a correctly tuned BPEL engine will cope...
but for those of us in the real world the only option I can think of that may work in 10.1.2.x is to limit the number of available threads (dspMaxThreads), and because that's a domain wide setting you'd need to create a seperate domain just for the processes with adaptors you need to limit.
I've read that in 10.1.3 you can specify process level thread limits.

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Set maximum instances for FTP polling

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