I have started working on replacing the OWL-based UI with one that is based on wxWidgets. This may take a year or two to complete. Or it may never be done. In the meantime, I probably won't implement any feature requests for the OWL-based UI.
This is a long-term investment with a potentially big payoff, one of which is that development on FMSLogo won't depend on a defunct compiler that stopped being supported a decade ago.