Currently only the original addon/module creator can upload new versions, no exceptions allowed.
What if the creator could have a list of mantainers/other people who are allowed to upload versions and perhaps change other things as appropriate(such as tags)? That would let others mantain/continue the addon while the original coder is not available.
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ToME online profile:
http://te4.org/users/zonkAddons (most likely obsolete): Wights, Trolls, Starting prodigy, Alternate save/resistance system