In the discussion forum, cchris raised the point that delimiter select should be able to handle escaped quotation marks. This is a good idea. The patch adds special handling for this case.
I haven't added any options for it, because I don't think it's worth it: If you're not a programmer, then you don't care about escape characters at all. If you're a programmer and set both delimiters to ", then you are very likely to want it to handle escaped quotes.