It is not recommended, as you will no longer be able to use the export and player subtitles specific options, but you can convert a Subtitles Track into a regular video track and use the subtitles as a regular TimelineFX. If you open the context menu of the Subtitle Track, there is a “Copy Subtitles Track above Video Track” option. You can also send back to the Subtitles tracks a regular video track via the “Copy to Subtitles Track” if the track contains only gaps and Subtitles FX.