If you want to use straight links for registration or login -pages on your forum, you might think modifying top_bar.html?
Find the original code (top_bar.html):
{if logged_out}
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">{lang:welcome} <b class="caret"></b></a>
<ul class="dropdown-menu">
<li><a href="{path:login}"><i class="fa fa-unlock fa-fw"></i> {lang:login}</a></li>
<li><a href="{path:register}"><i class="fa fa-pencil fa-fw"></i> {lang:register}</a></li>
</ul>
</li>
{/if}
..and clean that up to this:
{if logged_out}
<li><a href="{path:login}"><i class="fa fa-unlock fa-fw"></i> {lang:login}</a></li>
<li><a href="{path:register}"><i class="fa fa-pencil fa-fw"></i> {lang:register}</a></li>
{/if}
And then you have those 2 important links right on top of your forum page, see attached image.
(IMPORTANT: This is not official method, and I have tested this only with Chrome and IE on computer and with iPhone4 on mobile).
Cheers!