To allow users to use space between in case using username with two word ( eg: Black Water ), we need to modify class/userutility.php file by replace:
$restriction = '/[\000-\037]/';
$restriction = '/[\000-\040]/';
and this is will allow users to use arabic letters too. Also it will be good if you allow webmasters to select username restriction level during installation.
We can add new step in installation wizard to allow webmaster to fill:
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