1) There is no tag editor on the back end. Each document must be opened and the tag edited there. The documentation shows there should be a tag list for editing under the components menu, but it doesn't show.
2) When we had '&' in the name of a tag it didn't filter properly from the tags module. ie: if there are 100 documents tagged "One & Two", it showed all documents when clicked in the tags module. The other tags from the same module don't have the same issue. In the tags module it does show the correct number of documents, but when clicking to view those tagged documents it just shows everything.
3) Maybe this is related to #1, but it would be good to have a way to organize the display of tags in the module. Right now it's in the order the tag was added, not alphabetical, etc. There's no option in the module to change that.