I've apparently been sitting on this version for 10 months not realizing I didn't release it, whoops!
New automatic parenting option, which is the default behaviour, which will parent the lattice to the same bones as the deforming bones of the nearest vertex to the cursor. This means:
You no longer need to figure out which bone you want to parent your lattice to.
The lattice now follows the deforming vertex even if it's deformed by many bones. (But not if it's deformed by shape keys or other modifiers!)
Fixes the lattice not spawning at the cursor when selecting a parent.
The old behaviour of manually selecting a parent bone is still there, just have to switch the "Parenting Method" option from "Automatic" to "Manual".
The "Automatic" option will throw an error when the mesh you're trying to lattice deform is not deformed by any bones.
Replace fall-off expression with preset fall-off shapes (Linear, Smooth, Root, Sphere, etc). Much more artist friendly, and easier to try out different falloff shapes and see what you like.
"Adjust Falloff" operator is no longer an operator, just a set of properties in the UI.
Added poll messages, so if an operator isn't available, the UI will now tell you why.