Comment 6 for bug 754572

I wouldn't introduce a restriction to tags. In my point of view the taskeditor and its freedom is the best feature on GTG. You can write whatever you want and if you use special formatting, you are able to assign tags, subtasks, etc.

A tag is an information as any other and you can replace every word to highlight it. Example:

<task>
Go to @work earlier

I need to complete my task before my @boss comes to @work.
</task>

It is quite an extreme use case but it doesn't interfere with others.