One workaround for users here might be to generate RSS feeds using Page2RSS, a third party service that scrapes web pages and publishes RSS feeds when updates are detected.
Since there is no way to link to the last page of a phpBB thread, Page2RSS has to be instructed to monitor threads sorted by date in descending order by including sd=d in the thread’s query string. view=print must be added to prevent Page2RSS from monitoring the “Who is online” section at the bottom of every page.
To help automate things, I’ve modified the bookmarklet provided on the Page2RSS homepage to include the custom query string and automatically open the RSS feed in Google Reader. Here it is, nearly untested, provided for your convenience:
javascript:(function(){if(!window.page2rss_bookmark_urlr)window.page2rss_bookmark_urlr=function(ur){if(ur.error)alert(ur.error);if(ur.page&&ur.page.feed)location.href='http://fusion.google.com/add?feedurl='+encodeURIComponent(ur.page.feed)};var r=document.getElementById('urlFormRequest');if(r)r.parentNode.removeChild(r);r=document.createElement('script');r.id='urlFormRequest';r.type='text/javascript';r.src='http://page2rss.com/api/page?url='+encodeURIComponent(location.href+'&start=0&sd=d&view=print')+'&callback=page2rss_bookmark_urlr';document.body.appendChild(r);})();
I couldn’t figure out a way to link to it here using BBCode, so instead I’ve posted it on this ad-overrun website: http://marklets.com/Subscribe+to+Sublime+Forum+topic+in+Google+Reader.aspx