Strange, I am on Windows and jump back doesn't seem to work. German keyboard (notebook, so can't check numpad), and alt+- does nothing. The menu entry does nothing either.
jps, while you are at quick panel stuff, have you considered the following two changes / features:
1.) Keep open quick panels open when you alt+tab away from the Sublime window. At the moment, Command Palette stays open, all others close. Strangely inconsistent.
2.) Add a command to reopen the last instance of Go to ... , with saved input