This would be a very useful feature fo us. We (just as most people here) have a lot of users in the system and sometimes you need to contact someone who made/modified a specific email or landing page - but without beeing able to see who it was makes that difficult..
Right now I am only able to see who has modified smart campaigns (not always who created it even though I sometimes can see from the date and time that it is the same person that last modified it). So a more consistent behavior here would also be appreciated.