Please Please!! I love see to see some traction on Homegenie running on a Raspberry Pi 2 with Windows 10 IoT. I have one running and would be happy to work with you to test it out.
It is a full windows core (no gui) with .net and already has drivers for Aeon Labs Z-Stick, see this post for detail, however, I am not sure how MS ZWaveBackgroundService would interface here (whether the service can just be disabled and run the current zwave stack or if the software would need to be updated to work with that zwave core). but I can confirm that Win 10 on Pi 2 supports the Z-Stick.
https://social.msdn.microsoft.com/Forums/en-US/1f5c8539-f4a3-4fb8-947f-e7d03c213d86/zwavebackgroundservice?forum=WindowsIoTI am especially interested as my current Pi B+ with raspbian seems to lose connection to the Z-Stick and it needs to be re-plugged or pi powercycled to regain connection to the Z-Wave network every few days or so.
Also they do have native C# function to access the Pi's GPIO's and I would love to also eventually see support for that as well.
I see that you have your source code available and I will begin looking into maybe getting that into a universal app (.appx) to be installed to the win 10 IoT. But as I am just starting to get my feet wet in programming (C# and Perl) I am not even sure where to start for that.