Relative links in the Activity RSS feed

The activity settings, which contain node-title-link tokens create relative URL in the RSS feeds. As a result certain RSS feed readers cannot handle property the activity RSS feed. One fix of the issue would be to store absolute URLs in the activity table. For example if you change in nodeactivity.module following line from:

          'node-title-link' => l($node->title, 'node/'. $node->nid),

to

          'node-title-link' => l($node->title, 'node/'. $node->nid, array(), NULL, NULL, TRUE, FALSE),

it will create absolute links. There is one shortcoming with this approach, though. If you change the root address, it will cause the links to stop working. A better approach would be if the Activity module continues to store only the relative part, but construct absolute URL when in the RSS feed.