HST/STIS Recent Instrument Highlights and Calibration Updates: CCD Rotation, Coronagraphy, Spectral Defringing and Flux Calibration

The Space Telescope Imaging Spectrograph (STIS) onboard the Hubble Space Telescope continues to provide a unique resource to the astronomical community in its capacity for UV to NIR observations across a wide range of imaging and spectroscopic modes. We present an overview of recent STIS updates across a variety of instrument use cases: (1) an investigation into the long-term rotational evolution of the CCD position angle, and comparison with recent studies of spectral trace rotation; (2) a summary of existing coronagraphic modes and available tools for high-contrast image post-processing; and (3) the official releases of new spectra defringing tools for the G750M and G750L modes and flux calibration methods for echelle spectra taken in the E140M mode.