[RCU] How to configure timeout on external http calls

hey, We are facing a problem with tiny_mc plugin where users seems to be inserting media/images by placing external urls which doesn't seem to respond for ever. As a result, all our httpd processes are waiting on those external network calls and affecting rest of the users. We have temporarily disabled tiny_mc and looking for ways to configure timeout either globally in roundcube or specifically for this plugin for ALL external http calls that roundcube makes. Any help is highly appreciated.

Thanks!

fyi - we are running : roundcube-0.6-81336 php-5.2.5-1 httpd-2.2.3-45