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Quote:
Maybe I'm too paranoid but it reminds me of file names with spaces and strange characters which I really don't like.
You
are paranoid.
Quote:
Maybe no problem but it just smells of trouble and requires some serious checks for any security issues. Maybe display only but at login time it does matter, it makes me a bit nervous.
You
are paranoid.
Oh wait, I already said that.
There are no security issues that I could even begin to imagine. That is, no more security holes than currently exist (if any) in allowing names without spaces. A space is just another character like "a" or "b" or "c"; it's " ".
The rules for spaces in user name would/should be that the name can not start or stop with a space and there can never be more than one consecutive space.
Pretending that a period represents a space...
"Brad.Jones" - Good.
".Brad.Jones" - Bad.
"Brad.Jones." - Bad.
"Brad..Jones" - Bad.