Well, the reason for the naming change was that the old method only worked if you had everything in one html file and then split that. If you were compiling a book from several files with chapter markers and then split them it could result in a great jumble in which it wasn't clear how the split files related to the original ones.
It might be possible to allow the split name to be specified in the hr tag, something like
<hr id="New_Filename" class="sigilChapterBreak" />
which would then specify the name for the file created after the tag. The filename would be limited to valid properties for the xhtml id attribute:
Quote:
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ID and NAME tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods (".").
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which is probably a good thing, though the colons would have to be stripped out.
As for the problem you had with the ToC - did you have spaces in the file name? I hope all the issues with spaces should be fixed in the next release.