HT configuration as alternative output?

The Preamp description says it can be configured with HT bypass. I’m not interested in home theater at all but am wondering if this means I can configure the preamp to have a second set of outputs to drive a headphone amp while the regular outputs are use to drive the regular amps.

No, it means one of the inputs can be set to a fixed volume as a pass thru for the home theatre preamp section to drive the left and right channel amplifiers.