BorderOcclusion provides a streamlined way to select the back side of a mesh without toggling X-Ray or Wireframe modes. Inspired by Modo's selection workflow, it allows users to assign different mouse buttons for surface-level and through-mesh selections. For example, left-click can be set to select front-facing geometry, while right-click or middle-click selects both front and rear geometry simultaneously. The tool supports both Rectangle and Lasso selection modes, which can be toggled via an on-screen icon or a custom shortcut.