How about having a Reload button in the environment tab to force keyshot to reload the HDR its currently using?
If you create hdrs using an external app, (such as HDR light studio) you tend to go through a lot of iterations, being able to reload the HDR with a single mouse click would speed things up.
Add my vote as well. Currently, re-importing edits to an HDRI is time consuming. A reload feature would be a nice feature.