Sounds like I should keep the separate tags then, since easier is better.
I have another question, I think most users won't now a posts postnumber and probably will have problems finding it in the URL even if it is explained where it is. A suggestion is therefore to show the postnumber of all posts, to make it easy to know what to write in the tag. Does anyone have any ideas on how to show this? The best I've ocme up with is to put it below the time (and IP) in the post header.