Removing the “jump” from RSS feed

i am wondering if it is possible to have an RSS feed produce “jumpless” entries when the actual page includes them. The question is actually not for my blog, but for some that i read. Basically i read most of the blogs i follow via RSS feeds. Most of them are actually WordPress hosted pages. On some of them (though not on all – incidentally mine doesn’t do this, but i don’t ever remember changing any settings to make that be the case), when someone includes a “more” tag, i have to click on the title or the “read more” link and actually visit their page to see the rest of the post. Is there a way to have their feed include the full post? i figure if i ask them to make the switch it’d be nice to tell them how to do it.
thanks!