There is a bug whereby If you have selected enhancements and then undock the tree to move it you lose all of the enhancements and have to re pick them. So if u are planning to move trees around you might as well do it first an save yourself some work.
On the other hand when you undock and redoc it resets the enhancements so it means that you effectively get a free reset which is nice since i keep making mistakes and it is getting pricey.
It seems like the race characteristics cannot be undocked which means they can't be moved is that WAI? It also means that you will not get free resets of racial choices so pick carefully.