QUOTE(Fandango @ Jun 30 2007, 19:22)

Just rip the files so that within their file names the track number comes before track titles. This so obvious, isn't it?
It is obvious. Most rippers add tag numbers by default and can use a naming scheme that uses track numbers in front of any changing information. That is not the topic here.
QUOTE
But once the harm was done and the file names have the track numbers missing, the only thing you can do is to rename the files manually before loading them into MP3Tag.
This is also obvious. This topic is needed because of this obvious problem. Dragging the tracks to the desired order would be much faster than renaming or tagging each file manually.
As I already said, the user may want add new track numbers to a personal compilation that consist of files that are from various sources. Even if the files in the compilation happen to be from previously ripped CDs probably they contain old useless track numbers in the filenames and tags.
I was surprised when I first realised that Mp3tag doesn't allow dragging the files in a new order before auto-numbering. This is possible with many other programs that I use regularly, so the problem is not a biggie for me. However, the OP could post a feature request in Mp3tag's user forum.