The attach point/feature center issue has already been added to the fix list.
I'm sorry, but I still completely disagree with you on changing the name of combine tracks. The whole methodology of working with TrackerViz is using little solid layers to represent trackers, which is a much more visual way of working with track data than just looking at the path in the layer window. Track combine does just what it says it does. It takes one already-tracked solid which is dependent on another solid for its position, and combines the two down into one. It adds their values together and gives you a new solid with the values combined.
virtually baked using expressions? that doesn't make sense to me. An expression is live, editable data, and keyframes are "baked" from that data. There is nothing baked about a live expression. That is what "baked" means in every program - converting live data to real keyframes. Which is exactly the difference between picking expressions or keyframes from the drop down menu.virtually baked using expressions
If you are not happy with combine tracks, I simply suggest you don't use it, or use it in whatever fashion you want. In 7 years of working on feature films, I have had to correct tracks on almost every single movie I have ever worked on, and nab made TrackerViz for me based on things that were developed in-house at a Hollywood studio that helped us work with the tracked data as much as possible before applying it to the necessary layers. Combining tracks is a big part of that.