[split] Verbose cipher?

[Juan_Sali]

One option I think is missing from your overview is that the VM plays around with the room left between certain glyphs or glyph combinations. Sometimes there is a small space, sometimes a big one, sometimes it's confusing. So what about a scenario where they are converting their plaintext to Voynichese, and for some reason leave more space after certain glyphs independent of whether or not they were at the end of the word?

In my opinion the small spaces are made intentionally. The spaces are a way to separate monograms/bigrams/trigrams, a way to cut a sequence and start a new one. The small spaces make it more difficult to decide if it is a monogram, a bigram or trigram, depending of the spacing or not spacing the result is different. 
You can check if most glyphs sorrounding the small spaces have a coincidence with common bigrams or trigrams. (I would answer yes from my observation of the text).