Elevation angle selection does seem to be broken and I'm not really sure why, I'll take a look at it if I get some free time. Elevation SHOULD work in the same manner as the azimuth values do (except over a range of 0=horizontal to 90=vertical for elevation rather than 0=north, 90=east, 180-south, 270=west for azimuth) and blend with any azimuth value, but it seems that there's a math error in there somewhere. Maybe more than one.