Might be a silly question but I didn't find anything of use to this issue. Actually I've only found people's concerns about this feature being BAD. The irony is I need it this way - my rss content to be everything before the more tag and excluding everything after.
I tried "summary" option, pinged feedburner and it still shows the full text. Also I'd be glad if someone could advise how to exclude a particular "class=" form showing in feeds.