When compressing (in 7z mode, at least), after compressing the original file, remove it. Rather than having the file that got compressed AND the compressed file exist after compressing, just have the compressed file exist. (Similar to how gzip or bzip2 behave)
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p7zip is not a fork of 7-zip but a port of 7-zip.
You should ask Igor Pavlov (author of 7-zip) for this new feature.
But don't expect too much because this feature is asked again and again in the 7-zip forums ...