Just another thought, nothing more. I came to the following conclusions a long time ago. Foobar and Mp3tag both are among the greatest creations. But there are thousands of users' demands. Instead of waiting in vain, i prefer to adapt myself: i divide most of my tasks between the possibilities of the "Musical Trinity" Mp3tag+foobar+Total Commander. If the mountain will not come to Mohammed, Mohammed will go to the mountain. 
But yes: if you need often the desired feature, i can understand your request.