Here's a topic that has been controversially discussed in the concrete5 community: Some users would like to be able to access and modify all the files on their web space where the concrete5 site is located within the dashboard.
It can be handy to quickly fix an issue with your add-on from your new tablet device while you're on vacation—it could also cause trouble with your partner, though. You don't have to remember an FTP account; getting access to the dashboard is enough to do any work on your website, updating content, fixing bugs in the add-ons, and so on.
Certainly, something that can be handy can also be something that can be a bit dangerous. Changing code on a site that is running on a production server should be well-thought-out. Being able to make modifications very easily can also break things very quickly. Being able to modify all files within a web application also means that the user account you're using to run the web server must have...