Is it possible for me to list "Title - Subtitle (if existing)" under the content in the sitemap? If so, what can I do to change it?

I would like to do the same thing in the mSearch reply under content but I guess I should post that in the right section?

Assuming that you mean only for News content...

Yes, you might be able to override the sql_col_title variable in modules/Sitemap/content/News.php file (or the corresponding file for mSearch), or override the function doquery in the same News.php file to concatenate the subtitle with the article title.

But the title would potentially be pretty long, no?

No need to post the same request in both forums. I'll delete the other.
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Sorry, I see that you meant Content, rather than News. The same approaches should work, but using the correct Content class, of course.

Yeah... I looked at it and I'll try some things. I'm not really a programmer but I've learned by 5 years of constantly editing phpnuke.

The reason is we have reviews in the content module and we use artist name for title and album name for subtitle.

Overriding functions requires an understanding of object-oriented programming. It's not that difficult, but can be if you haven't any experience in that area.