When I commit and add Tag, I do this:

1) Show changes on the project
2) For each entry that I changed, I open the file, and then do a commit
3) For the open file, I click "Select in project".
4) There, I access the CVS menu and tag the file.

It would be nice if I can reduce this list of actions to achieve a same thing. 
The reason I have to open the file first, because after update, I may not know
which file was just committed.  Sure I can search for it, but that's even more work.