There is a very specific piece of PHP code in the Vanilla source that handles the @mention usernames.
You will have to adjust the regular expression of that piece of code to allow for @mention usernames with spaces and even then I don't know if it will really work.
There is at least 1 other topic thread about usernames with spaces in the @mention
Search in the forum.
Answers
As far as I know there's currently no way to @mention usernames with spaces.
There is a very specific piece of PHP code in the Vanilla source that handles the @mention usernames.
You will have to adjust the regular expression of that piece of code to allow for @mention usernames with spaces and even then I don't know if it will really work.
There is at least 1 other topic thread about usernames with spaces in the @mention
Search in the forum.
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No problem - there's a few so i'll just edit their usernames and email them all.