Just 2 suggestions for the tool.
1. The transform settings panel is full of setting that are not required/used in this transform mode or any other transform mode. It kinda feels like a bug to be honest, you have them separated by groups and some options like "use pivot point" repeats in some groups. Can the non used groups be hidden? If i select Scale, only show scale group, if i select Warp.... then show the next point.
2. Options for warp does not exists. I think it's missing a way to split the grid more. In clip studio they give you the option to pick the number of horizontal/vertical lattice points (from 2 to 10). This would give us more control over what gets transformed and what doesnt. So in warp options, add a group that lets us split the grid.
Excellent addition to the app and really fast, congrats :]