@allusion: hmm... on the one hand this could lower the bar a little for people who are not too knowledged with PHP/HTML at all. On the other hand the question is if those people could manage to get WordPress up and running at all.
I'm not sure at all... having a patch ready would allow to have this setting in the options, but one still would have to manually add the new feature to their template. In the end it's the same problem as adding just a line with the "hardcoded" key to the template file, but additionally the patch would need to mess around with the database...
Well, it seems you convinced me, allusion :)
For those who seek help for adding the key to yout index.php: have a look at the explanation given over at feedster.com (the file you'll have to edit is index.php - you most probably want to insert the line below the generator meta tag (line 13 in the "factory default" index.php)).