Well I have so many extra configs they are way off the bottom of the screen (laptop, not mobile).
Scroll on mousepad is rubbish at best so just for me yes its useful.
I sure you all in dev-land are fed up of us finding these little bugs post-release when it's been available in beta for months, but I'm also sure many (business/non-devs) people could not justify spending time finding these things until 1.55 was a proper release.
Anyway I found there is an issue about this with bootstrap and drops downs as can be found
http://stackoverflow.com/questions/12630188/allow-click-on-twitter-bootstrap-dropdown-toggle-link?lq=1
https://github.com/angular-ui/bootstrap/issues/2156
And in my meagre testing I found that changing this in header navigation allowed it to work. Can't say I had the energy to understand why (after a day in the snow).
Useful to know what others find:
<a href="<?php echo zen_href_link(FILENAME_ALT_NAV) ?>" class="dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true"><?php echo $menuTitles[$menuKey] ?><b class="caret"></b></a>
to
<a href="<?php echo zen_href_link(FILENAME_ALT_NAV) ?>" class="dropdown-toggle **disabled**" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true"><?php echo $menuTitles[$menuKey] ?><b class="caret"></b></a>