No hack needed for that.
In your getinfo template find this:
Code:
<tr>
<td bgcolor="{firstaltcolor}"><normalfont><b>Status:</b></normalfont></td>
<td bgcolor="{firstaltcolor}"><normalfont>$userinfo[usertitle] <img src="$userinfo[avatarurl]" border="0" align="middle"></normalfont></td>
</tr>
Below it add this:
Code:
<tr>
<td bgcolor="{secondaltcolor}"><normalfont><b>Member #:</b></normalfont></td>
<td bgcolor="{secondaltcolor}"><normalfont>$userinfo[userid]</normalfont></td>
</tr>