You don't need a mod, just edit the FORUMHOME template and take out that part. Or you could comment it out to make it easier to put back later. Like this:
Code:
<vb:comment>
<vb:if condition="$activeusers">
<ol class="commalist" id="wgo_onlineusers_list">
<vb:each from="activeusers" value="loggedin">
<li>{vb:stylevar dirmark}<a class="username" href="{vb:link member, {vb:raw loggedin}}">{vb:raw loggedin.musername}</a>{vb:raw loggedin.invisiblemark}{vb:raw loggedin.buddymark}{vb:raw loggedin.comma}</li>
</vb:each>
</ol>
</vb:if>
</vb:comment>