For anyone who want url-friendly URLs , please modify :
showflat.inc.php , about line 1452 :
Code
    "facebookURL" => urlencode("{$config['FULL_URL']}/ubbthreads.php/topics/$facebookPost"),
    "tweetURL" => "{$config['FULL_URL']}/ubbthreads.php/topics/$facebookPost",

And I hope the future version can honor the "Enable Spider-friendly URLs?" parameter in "Primary Settings -> Advanced Options"

English is not my native language. I try my best to express my thought precisely. I hope you understand what I mean. If any misunderstanding results from culture gaps, I apologize first.