Hey Stromausfall, I haven't used C# with acknex in a while, good to see you're still developing it .
For the vec_compareValues and vec_copy features you've added;
I think it would be more OOP friendly to implement the IComparer interface to perform comparisons.
Also for the vec_copy method, IMO it's better to implement ICloneable, and in the 'Clone' method, serialize the object into a MemoryStream and return the new object.
Just my thoughts, don't mean to trash your design implementations, it's great as always