Spell ranks seems to work fine in vuhdo for me.

In vuhdo when setting up Mouse Key you can write like:
Left Button
Healing Touch(Rank 2)
And it uses rank 2, even though rank 4 is learned (tested it on my druid).

I think you probably just wrote the spell wrong, you have to manully write them, if you drag and drop spells from spellbook or it shows without rank.