Problem: Hardware volume controls (WiiM remote, physical buttons) only affect the local device, not the entire Roon group. Group volume requires using the Roon app.
Requested Feature: Add a configuration option to allow hardware volume controls to affect the entire Roon group instead of just the local device.
Benefit: More consistent with transport controls (which already work at group level) and reduces dependency on the Roon app for routine volume adjustments.