There is not yet the possibility to set the frame rate post mortem in Tentacle Sync Studio. But there is no need to set them anyway. They should sync perfectly.
The FPS declaration in wave files is saved as metadata in the iXML chunk of the files. It does not actually affect the timestamp of the file. You can see this like something as a “hint” for editing systems on import.
Is there a specific reason why you need to set the FPS of the files?