Not clear how to re-setup USB media player handler

[Anders Feder]

When I plug my Android phone into the USB port of my Ubuntu laptop, I am prompted on what action should be taken when devices of this types are plugged in. This good. However, I am reluctant to ask the dialog to never pop up again because I don't see a clear way to re-enable it if I change my mind.

There should be some way to open the "what action should be taken" dialog again. For instance, in the context menu of the mount icon on the Unity launcher.

Steps to reproduce:
1. Plug in USB media player.
2. See "what action should be taken" dialog.
3. Select "Do nothing" and check the "always perform this action" checkbox underneath.
4. Next time you plug in the USB media player, the dialog does not come up and there is no other apparent way to open it.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: gnome-settings-daemon 3.4.2-0ubuntu14
ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
Uname: Linux 3.5.0-18-generic x86_64
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
Date: Mon Nov 12 19:49:12 2012
EcryptfsInUse: Yes
ExecutablePath: /usr/lib/gnome-settings-daemon/gnome-fallback-mount-helper
InstallationDate: Installed on 2012-10-25 (18 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MarkForUpload: True
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=da_DK.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-settings-daemon
UpgradeStatus: No upgrade log present (probably fresh install)
XsessionErrors:
 gnome-session[2001]: WARNING: Failed to start app: Unable to start application: Fejl under kørsel af underprocessen "blueproximity" (Ingen sådan fil eller filkatalog)
 (nm-applet:2102): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed
 (gnome-terminal:2668): Vte-2.90-WARNING **: Kunne ikke konvertere tegn fra UTF-8 til nuværende.