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Well, it's not dangerous at all since it is Calibre that is creating it (if necessary) and it would know whether to delete it. It wouldn't even have to add it to the library at all, just make a temp file somewhere. Obviously if it was already in a Kindle compatible format it wouldn't blindly do any deletions at all.
It's not really the disk space alone, although every little bit helps. There are a few other reasons. If I end up with a EPUB and an AZW3, it is not really clear which is the original retail format when looking at that book later. I have so many new books to read, it is unlikely that I will want to send it to the Kindle to be read for a few years, so it doesn't need to be kept around for the minor speedup of sending again to the reader. And even if I did want to keep it for that purpose, there are advantages to only creating the temp converted file when needed (right before the send) because new versions of Calibre will possibly make better conversions and might have fixed some conversion bugs.
It would still be a nice and cleaner feature to have an option to only create any converted files needed for that device on the fly without adding them to the library.
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