I installed the new v4.1 version and for the life of me cannot see any difference in the options compared to v4.0.1.
Looking at the what's new page i assume most of the new features etc. are under the skin, in the processing.
I was however interested in the 'Customized Part Additions' but cannot figure out how this should be done, i see no difference when importing a model etc.
Any information would be welcome.