Hi Arthur,
Ok. Agree.
- OK button should be disabled if no files selected
- file names column should not be truncated and should be resizeable together with dialog
- text field with number of selected files should be correctly layouted on resize (I have found also this bug)
About initial selection. I think all files should be selected by default. If you want only active file, you can use %FileName% tag.
Would be fixed with next beta. And I see you have installed 703

Best regards,
Alex