Right now, you can choose to either show the full Sith corruption your character has (Dark I, II, III, IV, or V), or you can turn it off and show no corruption at all.
Many people like the look of some of the corruption levels, but don't like the full, nasty-complexion, pale, etc look of the higher Dark levels. However, turning off Sith Corruption completely makes your character look like they are Light side.
I'd like to suggest that the on-off toggle be changed to a drop-down selection that lets you select the maximum corruption level that will be displayed. So, if you select Dark II, then that's the most corruption that would be shown. If you only like the orange-eyes look of Dark I, you could select that. Then, regardless of your Dark level (as long as it was Dark I or greater), you'd only show the orange eyes effect.
Certainly a minor priority, but I'd like to add this to the list of suggestions.