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There is an explicit option when you create the addon for whether to allow optional files/patches etc for the addon. If you go to the Optional Files page and see the links for upload, they've allowed it, so go ahead.
As well, some authors will state a license for their addons. If it's an open source license (GPL, BSD, MIT, etc), you are allowed to release it as an identical addon just changing the name as long as you attribute the original author (depends on license exactly what's needed for that). Patches would definitely be ok, as well as just maintaining it yourself as a new addon. For one of the major licenses, Google or Wikipedia can help a lot on what exactly you can do.
If there isn't a license and they didn't opt-in for patches, it's fully copyrighted except as covered in the Zenimax TOS and you can't do anything without their approval.
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