Mod seems to conflict with the Advanced Bone Tool; understandable as they, kinda, both perform the same function (I just like the ABT for more fine control of fingers and sub-bones)
Trying to select a ragdoll with the ABT that's already been resized with this tool just shows it as a "static_prop" and doesn't allow for any further modification.
Also having both of these installed seems to break or disable the unfreeze all (r) bind for some reason.

There's also incompatibility with the Advanced Color Tool; if you recolour any parts with it and then use the resizer the whole ragdoll gets recoloured as if you'd used the vanilla color tool. (Sub-Material tool works fine, though!) it's also not possible to recolor the ragdoll after it's been resized, probably for the same reason as above

Edit: I had Doors enabled and hadn't realised, so the first paragraph is no longer applicable.