This looks great and I appreciate the time you've put into this.
Just a quick try on y office pc (with no tuners), each time I check the box in config and restart NPVR, it's unchecked again and I don't get the option to scan.
I'll give this a try at home tonite and play with it.
Custom ASUS P8Z77 V-Deluxe, Core i7 3770k, 16 GB Memory-ASUS ENGTX560 DCII TOP/2DI/1GD5 GeForce GTX 560, H80i Cooler, 750W PS, CM HAF XM RC-922XM-KKN1 case,Corsair GS CSSD-F240GBGS-BK 2.5" 240GB SATA III SSD, InfiniTV4 & HDHomerun Tuners- running Windows 8 (and other goodies)
#2-M4A79XTD EVO-AMD X4-925-4GB Corsair Ballistix Tracer DDR3 1600-Antec 750 PSU-Sony DVD/RW-2-1TB HD's- CNPS9700 LED heatsink-HVR2250 & 1600 with HDHR in a Coolermaster 690 II case-Windows 8