I don't know about displaying the files on multiple lines. Wouldn't this create a very busy list, difficult to read, when the names of the files are of different lengths? Some of them would wrap on 2-3 lines, and some of them would remain one line?
Different workarounds can be found. But the fact remains: MC does not know how to handle files with long names. And in a world full of files with long names, this is a big problem, a bug. I am petitioning here for the fixing of this bug.