Anyway to use parameters when reading file from Web connection (Amazon S3)?

When using the "Select file from Web > Browse Amazon S3" option as the source for a reader, is there anyway to pass parameters in to the dialog?

I have some FME Flow/Server workspaces that are called with the bucket name and path as parameters, I'd like to be able to use those parameters instead of hard-coding the bucket and path.

Currently we use the S3Connector with parameters to download the files to local temp and then a FeatureReader to read them, but it would be nice to read them directly.

Thanks,

Andy