Hey Benjamin,
Vestax themselves only support the Spin controller with the Djay software:
help.vestax.co.jp . Any software that allows MIDI mapping can be used the set up the Spin. With Serato DJ you can use the Spin as an additional controller if you already own one of our supported controllers:
serato.com
At this stage we have no plans to support the Spin controller for primary use with Serato DJ. This could be something that is introduced in the future but I would not be able to guarantee that. Would you like me to move this thread to the feature request section so the right people can see what you would like?
Cheers, Sam