Personally, in terms of just convention, I've taken to the style of using "packagename/" as a function-name prefix in my own Elisp code. Since the hyphen is the conventional between-word character for function names, it sets it off much better visually.

But more specificially, I don't really like the idea of adding this "feature". I don't mind the extra characters in the function names. Verbosity and clarity are good things. So long as package maintainers follow naming conventions, that's far preferable to trying to read code that may or may not have apparent duplicate function names.