Apparently RecordSet paging is currently a ColdFusion-only feature. This leaves a fairly big hole in the Java/.NET implementation of Flash Remoting (including JRun). Many components, such as ListBoxes, that require a RecordSet DataProvider won't work properly. (For more details on RecordSet DataProviders, see RecordSet.as and RsDataProviderClass.as in your FlashMX:Include folder)
The following workaround has been suggested, but we haven't implemented it ourselves: Build the functionality yourself as another Flash Remoting service and set the ActionScript RecordSet instance's "serviceName" property to the name of the service that can supply subsequent pages of ResultSet data.
If you implement something like this, we'd love to post some sample code.
We hear rumors that Macromedia's next patch will correct this.
