On real hardware with the attached ROMs and esxDOS 0.8.7, after using the .128 dot command from the attached hdf, the editor works exactly as it works without divMMC. On fuse 1.5.1 without divMMC emulation, it also works correctly (in fact, it has been used for its development), but with divMMC emulation (see attachments), the "k" channel driver is broken, as is visible from the missing status line.
Upgraded to fuse 1.5.7, the problem persists.