A month or so back I decided to build a version that would use a 2nd USB stick in my computer to send commands to non-secured devices. The intent with this version was to build a more responsive z-wave experience, as often-times slow polling devices would cause annoying delays when trying to turn a device on or off. In our experiment in our demo home, it has been working pretty nicely.
If you have a 2nd USB stick laying around, I'd be interested in hearing how your own experience with this is. Please let me know if you had z-wave related slowdowns previously and if this has helped. To use this, add a port to your "2nd z-wave controller" box in the tools/options menu. Do note that you'll need to go offline/online again anytime you change this port.