I cannot create a new SLD for an ArcSDE FeatureType by clicking on the 'Create new SLD' when editing an ArcSDE FeatureType. When clicking on the 'Create new SLD' button, I see the 'Apply Style' and 'Finished' buttons, and a box area below that shows some basic info about the data, but not the information that I see when working with a shapefile. When I click on 'Create new SLD' for shapefile data, I see a bluish box above the 'Apply Style' button that allows me to set the label and colors, but this is missing for ArcSDE data.
I've tried both line and polygon geometry with the same result. I can manually build the SLD in the Style editor and then apply that style within the FeatureType editor. That's my current workaround.