@tabasco please, see the following discussion:
If you still want to block someone try this one:
About white-spaces etc. - sorry guys, but this would require intervention to the basic layout of Discourse which would lead to a breakage of the layout on different screen sizes and practically kill the ability to painlessly update the software. We already did some modifications of the skin and that created already a real mess (as you can see on some pages, like user's profile) - any further changes will totally lock us out from updating the software which is no-go.