[BirdOPrey5]

Look in the postbit or postbit_legacy template for the signature code:

There is already a conditional you can edit:

<vb:if condition="$post['signature']">

To allow the signatures on all forums except forum 2

<vb:if condition="$post['signature'] AND $thread['forumid'] != 2">

To allow the signatures on all forums except forum 2, but OK in forum 2 is staff

<vb:if condition="$post['signature'] AND ($thread['forumid'] != 2 OR is_member_of($post, 5,6,7))">

I haven't tested this but try it. If not it may need to be:

<vb:if condition="$post['signature'] AND ($thread['forumid'] != 2 OR in_array($post['usergroupid'], array(5,6,7)))">