You can use control obfuscation attributes (you can find the code of these attributes in \\SDK\\Obfuscation attributes folder, youcan use this code as you want - use partially, change visiblity of attribute classes, but don't change namespaces and names of classes) and use attributes-analogues of ExclusionPatterns/InclusionPatterns collections of Spices.Project:
ObfuscateMembersAttribute - analogue of InclusionPatterns
NotObfuscateMembersAttribute - analogue of ExclusionPatterns.
Attach necessary attribute to your assembly attributes and specify pattern to exclude/include some members from obfuscation.