In general, what can be some treatment options, besides palliative hospice care, for stage 4 pancreas cancer and extensive liver mets?

Recommend chemothera. There are more than one chemotherapy options. Seek advice from a medical oncologist. A combination of Gemcitabine and Nab Paclitaxel is one recently approved treatment regimen. Other drug regimens like FOLFERINOX are also commonly used.