I'm not sure how the code should be structured but here goes...
Open the xml product with your favourite editor.
Look for the following line:
Code:
if (THIS_SCRIPT == "index")
This means the plugin will only show on pages that are index pages, i.e. forumhome. You want it to show on 'adv_index' too. This is where I'm not sure of the code structure but try replacing it with something like this:
Code:
if (THIS_SCRIPT == "index") AND (THIS_SCRIPT == "adv_index")
Then reimport the new product overwritting the old one.
Like I said, not even sure if this will work but give it a go anyway. Maybe someone who knows what they're doing with the code will be able to confirm or deny.