Hi guys,
as I am not a friend of external tools, I tried based on Bbows solution and came up with this, so you don't need RS Mapper or a seperate Center command:
{down = inst_commands.Knob_Course, up = inst_commands.Knob_Course, cockpit_device_id = devices.NAV_INS, value_down = -0.5, value_up = 0, name = _('COURSE SELECTOR CCW'), category = _('Navigation Control')},
{down = inst_commands.Knob_Course, up = inst_commands.Knob_Course, cockpit_device_id = devices.NAV_INS, value_down = 0.5, value_up = 0, name = _('COURSE SELECTOR CW'), category = _('Navigation Control')},
You can replace the iCommandHSI_CourseRotary-commands in both default.lua-files (joystick and keyboard) and bind as you whish.