Tags being displayed alphabetically is a design choice in calibre. For many-many columns with order preserving properties, use the name like custom columns, as I posted before.
Changing tags to preserve order will require a fair bit of changes, in various places ranging from metadata storage/retrieval to UI widgets like the tag editor and so on. And since there is a case to be made for both approaches, alphabetical vs. entry order (I personally prefer alphabetical, it allows me to find a tag in a list of book's tags easily) and there is a way to have an order preserving many-many column, this is not something I am willing to change.
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