At present no. I believe the nfo files are scraped and then the information is put into the XBMC database. There are no database fields to store any commercial break information at present.
If it were to be added the format would almost certainly be different to the example provider, e.g. a strict XML element for the commercial break and then elements for the start and end times.
For example, perhaps something like:
Code:
<commercialbreak>
<start>12:23:45</start>
<end>12:46:46</end>
</commercialbreak>
I don't know what other implications there are of adding additional fields to the info file at present as I believe other 3rd party tools generate such meta data files for XBMC to read, e.g. Ember Media Manager.
It might be possible to add support for the existing EDL code to look up commercial break information inside an .nfo file, even if the information isn't added to the XBMC database. It's not really information that a person likely cares about viewing when traversing the library, so reading it at runtime is probably fine.
However, who is going to add information to the nfo file? Most of the commercial and freely available tools won't generate something like this... and if manually added would be obliterated if the nfo files were regenerated by a 3rd party tool.