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It is already implemented: You can use the Ctrl+BkSp shortcut to quickly select tags of currently selected notes.

I meant exactly that sometimes you want move, and sometimes - copy. Adding two separate shortcuts seems to be overkill. Does this feature really add that much compared to a simple Copy(Cut)/Paste? It saves just one keystroke. 

This is planned for CintaNotes 4.0. Since this is a major release I can only say that it is to be released sometime in 2nd half of this year.

Rule sorting and quick filter are planned as well.