I still like my solution
As others have said a disk change facility would be nice. Nothing elaborate - maybe something like this: All the disks would be placed in one directory and named in some prescribed way (say files are in WIN311 directory and disk are name 01.img, 02.img, 03.img - 11.img you get the idea). Then all the TSR has to do is trap two hot keys (say "ctrl +" and "ctrl -"). The TSR would then step up/down in the file name and load the disk. I am not a programmer so I am not sure how much bigger this would make the TSR's footprint. However, it should be less then a routine that pops up a dialog box asking for the name of the image each time. Of course it would be limited to install disk sets but that is when you would need it most.