No need to apologize. First, as you may recognized, I'm not a native english speaker. Additionally I have a distinct tendency to express myself complicated even in my mother tongue.
Second, I have to admit I haven't seen/used the file selector field while importing roms. Sorry, my bad. But actually this field does not help enough to solve all the problems. It helps to narrow the file selection to one file type. i.e. *.mds .This is o.k. and helps if you have one type you want to import. Sadly at the heyday of the cd there were a plethora of backup-image types invented, and most of them are multi-file. Clone-cd for example generated 01.img, 01.ccd, 01.cue, 01.sub for one disc. So when using the file-selector I would have to use multiple runs for every image type. To get them all in one import run I would have to combine multiple entries like *.ccd, *.mds., *.cue. But it seems this syntax is not supported in the file selector field. Is there a valid syntax for multiple file type definitions or is this not supported?
Regarding the multi-disk problem: Assume a game has 5 disks, wouldn't it be nice if lauchbox would only show one cover and asks you what disk to launch when clicked?