1. Open up the station with the PRP station editor (drag & drop or via the station list dropdown):
2. Select "(No Logo)" from the station editor dropdown:
3. Press the left "save button" at the very bottom and the logo is removed from your prp file.
Doesn't this work for you?
Submit portable freeware that you find here. It helps if you include information like description, extraction instruction, Unicode support, whether it writes to the registry, and so on.