I brought this idea up in bug #2713 but I've finally got around to trying it out. I've uploaded the changed file and I'd appreciate it if people, particularly those who use Glossary categories (and doubly especially those who use multiple categories), could check it out and give me some feedback on it.
To get it to work, copy or otherwise backup the file `mod/glossary/edit.html` and replace it with the file I've uploaded.
The basic difference is that you should see a list of the categories available in a Glossary on the right hand side of the text entry area with a checkbox next to each one, allowing it to be selected or deselected.
There are two main ways this could be improved:
* give the option, when updating a Glossary, to make the categories exclusive. If they are then the checkbox becomes a radio button and the 'not categorised' entry makes a comeback.
Any feedback will be gratefully recieved.
a picture's worth a thousand words: