I've been running JTDX with JTAlert and OMlog for so long that I can't recall whether Omnirig is used at all here, certainly not loaded as a seperate item.
Attached is a screen capture of my JTDX Radio config page. All I get out of it is PTT and the reporting back of frequency, the 847 has really limited CAT functions, no S meter or such.
73 de Ian VK6CR