Not a problem.

I've muddled through and managed to get it more or less doing what I wanted now - probably not even close to good CSS, but it seems to be working, which is good enough for me. Thanks for a great mod.
In case anyone else has a similar problem to the one I had, I fixed it by doing the following:
In the dropdown call template
Change
Code:
<div id="specs_$post[postid]" class="vbmenu_control">
to
Code:
<div style="float: left; display: inline-block;" id="specs_$post[postid]" class="vbmenu_control">
You may find that this causes the dropdown to overlap some areas of your postbit (it did with mine) - In the
Postbit Legacy template, simply add a couple of line breaks (<br>) after
Code:
$template_hook[postbit_userinfo_left]
and that should sort it.
That's how it worked for me, anyway. Hope it helps.