Hi! PrusaSlicer profiles are maintained regularly. Profiles for MINI/+ are available under PrusaResearch manufacturer in Cura after being imported using the guide above. Unfortunately, Cura is not developed by Prusa so there are only limited options on controlling how it works from Prusa's side. If there are any errors in how PrusaSlicer works, please feel free to report these at https://github.com/prusa3d/PrusaSlicer/issues
Hi! Check the new features in the PrusaSlicer 2.4 - there is this 3DLabPrint plane model support, which you might find useful for other single perimeter prints as well.