I don't know how difficult this would be, but it would be nice if we could specify the width of a Tag Panel item. Fields that take values such as 0/1, or 1 to 99 or a twelve character string don't need very much space.
What I was thinking was allow the user to specify the width as a percentage of the Tag Panel width. Say you had one item that was 50% width followed by another that was 50%, you could place them on the same line. Or you might have three items of 33%, all on the same line. Or say you had 50%, 33%, 33% - the last item adds up to more than 100, so it gets pushed to the next line.