Clipping from a tiled LAS dataset with LASTools (for ArcGIS)

I have huge amounts of lidar data stored as tiled datasets per project. The "tiles" are separate LAS files based on our national map sheet setup (800 by 600 meter). To keep an overview of the data I have set up LAS dataset definitions per project in ArcGIS 10.1.

I've been testing out the LASTools for ArcGIS toolbox to see if I could use this for clipping, as that's a function I'm really missing in ArcGIS. What I often want to do is to define a clipping area, and copy data within the area to a new LAS file. This area will normally contain parts of multiple LAS files:

However, it seems the lasclip tool only will clip from one LAS file at a time. What I'm looking for is a way to say - "give me the data from this LAS dataset in this area, and save it to a new LAS file". Am I missing something, or is that not possible here?

Edit: I've also tried posting this to the Lastools GoogleGroups, but without any response.