Currently, ignore backfacing in selections is prone to causing errors, since it is easy to miss whether this setting is on or off. There should be a visual clue in the UI and NOT just a tiny checkbox within the command panel filled with checkboxes and tools. Several co-existing options come to mind:
- Displaying objects in X-ray during selection (when the mouse button is pressed), both for object and subobject selection
- Put a select through (ignore backfacing) button in the main toolbar, next to the other selection icons. A change of icon/ highlight already indicates the state of the function much clearer.
- Highlighting the selection through other objects/ parts of the object in case it is occluded
- Giving the (box/lasso) selection window a transparant overlay colour and/or changing the cursor to indicate select through (ignore backfacing) is enabled.
The Blender addon, X-ray selection tools should serve as benchmark for features.