Then just don't use editor and update nfo from external source only.Please not overwrite the file (many information are available for alternative software) , Please make a possibility to update modified section only in NFO. PLEASEEEEEEEEusing internal nfo scraper option also it will overwrite old one if it exists, ).
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It will not be so hard to do in case of local trailer video (saved on HDD) but (it's just my personal statement ) I don't understand why you want to see some trailer when starting movie .
Personally, If I want to see something which is on my disk, I want to see that , not commercials or something else. I was blessed with AnyDvd when watching original Disks, just skip all intro trash and start movie.
Anyway, there is few issues in that, ie.: trailers not for everyone in the house, so there should be some kind of checking (link) between trailers and movies adn so on
I'have found on NFO, the section <trailer>, this can be added for import ?