How can I configure a StyleCop+ naming rule, in such a way that my variable name like controlUI, controlHVACTest, etc. gets validated successfully?
For now, since it is not in sampleName format, the StyleCop+ complains about the naming convention.
Also, what is the best way to add custom naming validation rules?
The most convinient way to allow names like controlUI and controlHVACTest is to add UI and HVAC into "Abbreviations" section.
Regarding your question about "changing AaBb to A*B*" - I'm not sure that I understand what your mean. StyleCop+ naming rules are very flexible indeed, but if you setup your naming template to $(A)$(*)$(A)$(*) (which seems similar to what you were talking about) - it will force all names to have at least two capital letters (that do not follow each other).
If you specify your situation a little bit more, I could try to help you setup your naming templates, if possible.