When opening a batch of photos in Denoise or Sharpen, you get a list of the files. On a Mac with a Mac Mouse scrolling up and down that list is so fast, that even a tiny flick of the finger sends you right to the bottom of the list so that you can not use this feature even after practise. The trackpad is only very marginally better, but also much too fast. Please address this issue in one of your next updates.
I have seen this as well, scrolling on a trackpad, but have never mentioned it during beta testing. I will do so.
No one commented when I raised this issue during some beta testing. I suggest you submit a report direct to Topaz itself. It seems to apply to all the major Topaz products that have batch processing!