Note that this is not the same as: Unable to edit posts with pending edits
Mistagged questions should be retaggable immediately.
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Well I just fixed this and a slew of similar requests.
If you would like to edit a post that has a pending edit and can't wait, you can click the Improve Edit button:
This button allows you to "edit the edit", add tags and whatnot.
At the end of the process when you submit the edit, the Community user will accept the suggested edit AND your edit will be applied:
We still disable the quick-retag menu, but offer you a way around the issue if you are in a rush.