Enhancing the performance and capabilities of the MIRI instrument on JWST

MIRI, the Mid-Infrared Instrument on the James Webb Space Telescope, provides the only capability longward of 5 µm on the observatory. In this regime, it is providing order-of-magnitude improvements over past facilities in a wavelength range that is challenging or impossible to access from the ground. As such, MIRI occupies a unique parameter space and offers unparalleled capabilities in all areas of astrophysics. Several years into its operational lifetime, we continue to explore the full breadth of MIRI's potential and make operational improvements to MIRI to create new capabilities and enhance its scientific return. In this paper we will describe several such improvements, and their anticipated impact on MIRI and JWST science - focusing on improvements in detector noise performance, improved time-series capabilities,  enhanced efficiency and flexibility of coronagraphic imaging, and a wide-field slitless spectroscopy mode.