LOD duplicates, limits and LOD distance labeling

[CyberMick]

1. When deleting LODs and then adding them again, I get duplicates in the Model Tree view panel. I noticed they don't have entries in them though and I can't seem to delete them either.
2. When adding LODs if you add 3 (the limit?) and then try to add a 4th, the only indication this hasn't worked is in the lua console panel, which is probably easy to miss if you have it covered with the Model panel.
3. LOD - Appearance - LOD distance has fields for X, Y and Z which is a bit confusing as the Crash Course video demonstrates them as the first, second and third view distance amounts.

Image provided for reference.