To review these third-party mods one needs to understand C++, Windows programming, and fairly obscure theming-related parts of its internals, some of which are undocumented/reverse engineered, and many have poorly understood side effects. This is a pretty specific combination of skills that slowly approaches arcane status, even if might feel otherwise to some. But again, larger apps are indeed harder to review than this.

(this particular mod is 100% innocuous, though)