As described at
http://wiki.simplemachines.org/smf/SMF2.0:News_and_newsletters#Settings it is possible to change the RSS feeds so that they do not truncate the text (setting
Maximum message length to zero means no limit).
Currently the limit is set to some small number, which makes the RSS feed unusable without a web browser. The wiki page I linked recommends this "because some users have broken RSS readers", which is a non-sequitor, but presumably is the reason for this setting.
If we could remove the RSS message length limit, that'd be awesome. I get most of my news over RSS in my email inbox, and it severely interrupts my flow when individual feeds require special attention to be readable. It also prevents me from forwarding or archiving forum messages.
Thanks!
Andrew