Your tip is not exactly doing what I had in mind but you gave me the idea to do what I planned. I just replaced the
PHP Code:
<img src="$stylevar[imgdir_misc]/nothumb.jpg" alt="" border="0" />
..with
PHP Code:
<img src="$thread[threadiconpath]" alt="$thread[threadicontitle]" border="0" />
Now want to add a function that allows users to deactivate the display of the thumbnail and show the regular posticon instead.
I am not sure how big this change has to be for this to work.