BootyMagic only works on female characters. Good that you asked about that, I forgot to put that info in the main post. Updated now!
There are no futa specific improvements in Naturalis for breasts, compared to the standalone TittyMagic. See the the spoiler tag in the main post for what was actually changed. Physics and morphing when soft physics is disabled was improved a bit, and that applies to futa characters as well, but it might not be something that you notice compared to the standalone TittyMagic - YMMV. You're welcome to sub and if you find it wasn't worth it, I'll refund you
v0.67 is not a version of TittyMagic, maybe you mean the package version 67 i.e. everlaster.TittyMagic.67.var (see
history)? That would be plugin version 5.2.1... which is equivalent to the latest version (v5.2.4 / 70.var) in terms of futa features.
-edit-
It's possible that a thigh joint angle based morphing system will be available for futa characters in a future version, kind of what JointCorrect does. Another possibility is the addition of custom glute colliders. These would at least offer some improvements, though 90% of what the plugin does would still be female-only.