I have another userbox question. I have a request to move the Thanks box next to the rank box thereby making the column wider. After going through the source I cannot find what I need to change. Is this change possible to make?

You can rearrange and/or add/remove the Items of the Userbox also in the Host Settings -> Templates Page.

In the section "User box template" The default is

 <yaf:avatar /><div class="section"><yaf:rankimage /><yaf:rank /></div><br /><yaf:medals /><div class="section"><yaf:groups /><yaf:joindate /><yaf:posts /><yaf:points /><yaf:gender /><yaf:location /></div><br/ ><div class="section"><yaf:thanksfrom /><yaf:thanksto /></div>

Moving the thanks to the rank would look like this....

 <yaf:avatar /><div class="section"><yaf:rankimage /><yaf:rank /></div><br /><div class="section"><yaf:thanksfrom /><yaf:thanksto /></div><br/ ><yaf:medals /><div class="section"><yaf:groups /><yaf:joindate /><yaf:posts /><yaf:points /><yaf:gender /><yaf:location /></div>

Is it possible to use those items in the DisplayPost.ascx file itself?

No, you can only use them inside the Userbox.