File Adapter - How to poll multiple directories?

I have been told that XI File Adapter can poll for one directory at a time. Is this really a limitation of XI File Adapter?

If not, could any of you from this forun, explain how to poll multiple directories from a single instance of an XI File Adapter?

Also, how could we schedule polling different time for each directory?

In other EAI tools such as SeeBeyond, where a single scheduler can trigger events to a poller to poll for multiple directories. This seems not available in XI.

Thanks and appreciate your help.