we had recently a long discussion on this thread about importing MadTracker files.
Resuming the contents: the Renoise developing team is not willing to work on importing other formats. Also, SKM format is far less popular than MT2. Honestly, Skale development has been inactive for so much years that users who have not already switched to a new program are so few that the importing work, which would also be very hard without SKM file format specification, would be valueless.
I acknowledge that this will make you unhappy, but we prefer to be clear about this topic.