I brought up the issue of periods in names in topic #8019 but it seems the ruling opinion was "they're visually unappealing and annoying to type". Doesn't make much sense to me, especially since we have tons of copyrights with periods that get aliases from the non-perioded version.
It was also brought up in topic #3590 but the thread died.
edit: Oh, mr_driller is a copyright, not a character. Well then I guess there will be no objection to the alias.