In any case I started to look for a customizable keyboard file or folder for LR on my Mac and, while looking, I found the following folder:
A double-click worked in Bridge to call PS so I did not see why it should not also work in LR. In re-learning Lightroom I began to wonder if it was possible to create user customizable keyboard shortcuts as I had become a bit annoyed at having to right-click and select Photoshop every time I wanted to use it from Lightroom. What brought me back was the rich selection of extensions and plugins for Photoshop, many of which will not work with any other editor. I have only recently returned to Photoshop and Lightroom after several years working with other workflow and pixel editor tools.