I don't think so, at least, I don't think there is a convenient helper to do this. I think because the multiple file upload you see in the file manager is partially flash based, it's pretty much hardcoded for a particular purpose and isn't available as a helper.

I think you'll need to look at how some of the other plugins handle multiple files. Many of them allow you to pick multiple file- the interface adds the last one selected to a list and lets you pick another. You only ever pick one file at a time in the file selection window though. Have a look at the way that the Slideshow block that comes with concrete5 handles this for an example.

In saying this, if you are selecting a group of files, are you potentially doing something that would be better handled by simply picking a set? Using the file manager, you already can upload multiple files in one go and add them to the same set right after the uploads have finished. Just a thought.