Gnome 3 in Fedora 20 proxy configuration

I have installed fedora 20 and i am using it in work when everyday i am at a new environment and i need to set different proxy settings...

In the old Gnome

In Gnome 3 that has changed

In the new gui there is a field called Method that has 3 options (Manual,Auto,None). I guess that in the manual option when you fill out the setting all those setting are stored in a file...

What i am looking is if there is a way to add more methods, for example then i click in the drop down box i will have more options (Auto, Manual, None, Custom1, Custom2). The custom entries i want to be manual have different settings and when i choose one i want those setting to be applied.

In any case i want to make Gnome3 to work like Gnome2.