Here are some small additions that I believe would be very useful for many.

I think it would be nice if  Browse for  Folder on Copy, Move etc (the three dots) opened up in the folder given in the path given (under Copy to for example).

If the folder does not exist then the "deepest" existing folder of the path could be opened instead. Before doing that however a query could be given if the folder should be created. I think that best could be restricted to the case where the parent folder already exists (to avoid mistakes).

Actually this is one of the things I have missed the most in 7-zip and it hold me back from using it for some time. Otherwise I like it very much.