i think ricardo thinks about privacy and it would also be a concern of mine.
sometimes you have customers sitting behind you and you simple don't want them to see which hoster you are reselling to them. if you named your server like "mysecrethoster.domain.com" and it is listed in the jumplist it is possible that you hover over it and someone sees something you don't want him to see.
it is allways good to have a ini/checkbox setting for such a thing "[x] show sessions in jumplist". could be on by default, but it is fine to be able to turn it off.
for me personally i dispabled the jumplist in globally, also i disalbed the awsomebar in firefox, the recent documents in windows,... why? i can't control what is shown there or better, i can't control what should not be shown.
for example, i really would like to use the firefox awsomebar autocompletion, but its simply not possible to white and blacklist folders from being show in the autocompletion. so i disabled it totally.
privacy matters, at least for a few of us :)