I think the first layer height setting is not immediately clear. It says "first layer" height, but with values under 100% the extrusion stays the same. This can lead to failed prints without the user knowing the reason. Please add the behaviour of this feature at least to the tool tip. Or why not have separate selections for extrusion and layer height to avoid confusion.
Another confusing place is the internal thin wall selection. The tooltip could contain a longer explanation of what the available choices mean.