It’s been over a year since this was first posted with no update. We’ve got VSTMA products nearly ready to ship but VSTMA clearly has bugs that Steinberg haven’t addressed. It’s hard to know what to do, many of these issues are well over a decade old. 
Cubase has poor support for microtuning, non-linear sequencing, arps, cc modification/sequencing, etc, and it seems to stem from the bugs in VSTMA. The MIDI plugins haven’t changed for many versions of Cubase and they’re antiquated by modern standards.
Is there any chance 2020 is the year for Cubendo MIDI FX?