Thanks for your response, Gregor. I appreciate you taking the time to answer, and that's a good workaround, although I still question this whole methodology.
I don't really understand why the bend markers have to be associated so permanently with the audio file. To my knowledge Studio One is the only DAW that works this way, and I certainly wouldn't agree that it's the most convenient way for most users. In Live, for example, the bend markers (OK, *warp* markers) are associated with the event (OK, *clip*) rather than the audio. All the information about the warping, timestretching, pitch-shifting etc. is contained in the event, and the event references the original audio, which is unaffected. You can have as many events as you like in your song, all referencing the same piece of audio and all doing different things with it. There's no need to duplicate anything, and each audio sample is only stored in the project once.
For music editors, like me, your workaround is going to double, treble, quadruple the size of every project compared to the same project in Live. It's also a lot slower and less convenient, and it goes against the whole ethos of Studio One's drag & drop functionality. So I'd like to keep this here as a feature request.