I would love to have a manual season/episode mapping option on Sonarr. As much as I think the community needs XEM I have been waiting for at least a year to try and get an account for XEM and reading previous issues with XEM it seems they can take a long time to map the corrections for shows that are not world wide or popular.
Anyway, for my issue I see the solution as a simple option in a series to manually map the season numbers up or down. The TVDB has current “The Gadget Show” season as 29, this is due to “The Gadget Show World Tour” being counted as a different show with 2 season in 2012/13.
The Gadget Show releases are currently at season 31 and have been out of alignment since 2012/2013. Hence the solution of telling Sonar to search and download season 31 and match it to season 29, all the way back to season 16.