after uninstalling

The easiest solution I have for you is to change your forums to a new directory. then  301 redirect the entire old directory to the front page of the new forum. I've had to do this in the past, and not only did it not hurt my google rankings, but I actually got more traffic. I think google sees it as a total site overhaul and gives you kudos for the change.

add a .htaccess to your root directory or add a line similiar to this to your existing .htaccess. It must be in your http directory or root directory, not your smf directory.

Redirect 301 /smf http://yourdomain.com/newdirectory/index.php

This will redirect everything in the directory smf to the new forum index page in the new directory. use repair_setting.php (which you can get at smf to change the name of the directory your forum is in)

Did you solve this redirect issue somehow? I also wan't to remove seo4smf but I want to redirect the beautifying urls to SMF's old urls.