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This was done for pdf a while back, the 'Preprocess input file to possibly improve structure detection' option. I just doublechecked, and it does still appear to be working well in the latest version of Calibre. Is that function still in preprocess.py?
The regular expressions used for pdf don't apply to Lit/Txt files, but couldn't new regexes be defined for each input format, and then automatically used based on the input format when that box is checked? I've been running into more Lit/Txt files with this problem lately, so I could see if I could get it working if this is a good approach.
There used to be an option to tweak the average line length detection logic, but that appears to be removed (from the GUI at least).
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