Pro Tools has a great 'Identify Beat' feature, where you can navigate to any point in a track and say 'this is beat X.X', then it will automatically change the tempo settings of the song to make that hold true. It'll even add further tempo changes if you flag additional beats in later parts of the audio.
This is really useful when importing audio where a click track wasn't used, and the artist(s) were perhaps a bit 'loose' in their tempo. For more details, see this video.
I'd love to see this available in Studio One! Really want to get away from Pro Tools as much as I can, so it's always a shame when S1's lacking a useful feature. Sadly, there are only manual workarounds right now, which can be quite time consuming.