Automatically delete unused samples of the Sampler

Everytime you drag a sample in the Sampler the sample is copied to the audio-folder of the project. When trying out different samples for a specific track to find the right sample there can be a lot of samples in the audio-folder that are acutally not used in the project. The only way at the moment to delete those unwanted samples is to manually delete them in the Pool.
I think it would be great if there was an option to automatically delete those samples.