In perfect (my) world, I would like to:
- sort files by "type"
- select all within this type group
- click to "Add"

Now, besides I never understood why would I want to "duplicate" anyway, instead
of message
"One or more files selected already exist in the script. Add duplicate file(s)? Yes / No"
would be nice to have "Replace" also.

But, like I said, in perfect world... <g>

Would like to hear your comment about this.
Thanks, Darko