[skhms]

You could edit the postbit and/or postbit_legacy templates to show the real names field below the username.

In the postbit template find:

<if condition="$post['usertitle']"><div class="smallfont">$post[usertitle]</div></if>

Above it add

<div class="smallfont">$post[fieldx] $post[fieldx]</div>

Change the x to the id of the custom first and last name fields.
This is just an example, you can of course test to put the real name some other place.

Edit: Changed to what I think is actually the right variable...

/SK