Disk Utility should not show unsupported features until proper dependancies are present

[komputes]

Over time with use of Disk utility I realized that when I try to do something a message given is unclear, when it should tell me about about a missing package. I have gotten this in the pas trying to encrypt a disk without cryptsetup installed and now with xfs. Do not show an option if dependent software is not installed.

Error creating file system: Cannot run mkfs: cannot spawn 'mkfs.xfs -L "New Volume" /dev/sdb1': Failed to execute child process "mkfs.xfs" (No such file or directory)

I would expect the program to either:
-Not display features until those packages are installed
-Interact with gnome-app-install to propose easy installation of needed packages

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: gnome-disk-utility 3.0.2-1ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-10.16-generic 3.0.4
Uname: Linux 3.0.0-10-generic i686
NonfreeKernelModules: wl
Architecture: i386
Date: Mon Sep 5 10:06:04 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha i386 (20110817)
SourcePackage: gnome-disk-utility
UpgradeStatus: Upgraded to oneiric on 2011-08-27 (8 days ago)