I am an end user and sometimes we end-users have some ideas. I would like to present ideas for Fedora22 and for Gnome.
The greeter screen needs to show the "message of the day (/etc/modt)". We often need to inform a user that perhaps the system is unavailable for certain hours, or to advise of
some other advent (new software, a birthday, etc)
On my system which has 3 users, the window with all has 10 radio buttons. Program names are not distributed linearly. Searching for one is frustrating
The recommendation is to use the space to the left of the radio button to indicate the name of the first icon corresponding to that radio button. Two characters would suffice. Thus, a program beginning with "Ma" would appear with the radio
button ke (o).
This one change would add convenience to using Gnome and would help reduce the number of right hand for-finger mouse clicks, that, after a day of work, leaves the user with painful tendons.
An image is attached below my signature