No, that is not possible. The way {tags} work in memoQ is, they stand for something that constitutes the structure of the original document (the "skeleton"). Without that skeleton, there is simply no way memoQ can restore a correct document at export. Not copying tags and allowing export would simply result in a file with DOC extension (for Word DOC's) that can do one thing: crash Word when you open them...
However, Word documents will sometimes show tags that clearly do not stand for anything sensible (especially if the DOC was created from a PDF file). Such tags are also called rogue codes. For some ideas on how to get rid of them, see Getting rid of codes in Word documents in the Tips and Tricks chapter.