just discovered that the HD has a gyroscope, so i "ported" the latest 4.2.2 GalleryGoogle clock and gallery from the nexus 4 factory image.
basically just replaced the "Nexus 4" values in /smali/com/google/android/apps/lightcycle/panorama/DeviceManager.smali with "DROID RAZR HD" (ro.product.model value from build.prop) to get it to work.
also added stock motorola icons to /res/mipmap-xhdpi, and commented out a style block at line 168 in /res/values/styles.xml that was causing apktool to throw errors on recompile.
photosphere works, but i guess i haven't gotten the hang of it yet; the stitched images don't look seamless.