Nah you don't need to register options, stylevar or user variables. I've used them fine in my custom template without any issues. I'm not sure which others are registered globally but I've used those arrays already in my custom templates. So I know for sure they're already globally registered.
Examples of userinfo, options and stylevar variables:
{vb:raw bbuserinfo.username}
{vb:raw vboptions.bburl}
{vb:stylevar imgdir_misc}
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