Haha, I've been doing this on my site for a while, it works great =D
I have the Last posts / threads / posts fields empty, but of corse you can add those in.
Put this right above $forumbits on your forumhome template
Code:
<!-- sponsored links -->
<tbody>
<tr>
<td class="tcat" colspan="5">
<a style="float:right" href="#top" onclick="return toggle_collapse('forumbit_1471337')"><img id="collapseimg_forumbit_147" src="images/buttons/collapse_tcat.gif" alt="" border="0" /></a>
<a href="#">Sponsored Links</a>
</td>
</tr>
</tbody>
<tbody id="collapseobj_forumbit_1471337" style="">
<tr align="center">
<td class="alt2"><img src="images/statusicon/forum_old.gif" alt="" border="0" /></td>
<td class="alt1Active" align="left" id="f146">
<!-- ################ -->
<!-- ################ -->
<!-- ################ -->
YPN / ADSENSE CODE GOES HERE
<!-- ################ -->
<!-- ################ -->
<!-- ################ -->
</td>
<td class="alt2" nowrap="nowrap">
<div class="smallfont" align="left">
<div style="clear:both">
</div>
<div style="float:left">
</div>
</div>
</td>
<td class="alt1"></td>
<td class="alt2"></td>
</tr>
</tbody>
<!-- /sponsored links -->