I realize this is a very old thread but I would also like to see a hot pixel filter.
As a work around, I found that if I open the raw file in Raw Therapee (portable version available), then use the "Edit current image in external editor" option at the bottom of the RT interface, it will transfer the image over to AP. Affinity Photo can be selected as the external editor in RT's preferences under the General tab using the "Custom command line" of C:\Program Files\Affinity\Photo\Photo.exe
It brings it over as a tiff file so there's no data loss. Not the ideal solution, but it works seamlessly and you have the added benefit of using Raw Therapee's DAM.
