There has been some discussion about how "broken" this package would be, in the light of the current cssu state.
Looking at it more closely (version 0.9-77, the last extras-devel), I would say it is less broken then some suggest

Themes:
I did not test that, but I do not expect something to be broken.
My only concern would be if you have more than the default 4 desktops/wallpapers. Portrait wallpapers are not supported.

Fonts:
Changing fonts is done by search/replace in transitions.ini, so it is not logical that it would be broken. Tested and no issues found.

Font size:
Done by changes in css templates? No issues suspected.

Font colors:
Done by changes in css templates? No issues suspected.

Color changes:
I don not expect cssu has had any impact on this.

Use custom (fast) window transitions:
Could give issues as it uses it's own transitions.ini..

Show app shortcut/app shortcut size/web bookmark size:
This uses a gconftool command, which does no longer have any effect in cssu (tested). That's why it is grayed out in that case.

Snap to grid:
Done by search/replace in transitions.ini, so it is not logical that it would be broken. Tested and no issues found.

Opacity settings:
Tested and no issues found. Also confirmed by thedead1440.

Change backgrounds:
For apps like the mediaplayer. Tested and works fine.

Some remarks:
Theme customizer has it's own hildon-home, which it may use in some restores/backups. But it never uses that file when cssu is found to be installed.

One other point is that is keeps track of some changed settings (like snap to grid size). If you change that value by hand in transition.ini, it will still think it has the old value and will set that value if you decide to save and you did not correct it first.


So I decided to carry out some changes.

• I added portrait layout support for the various screens. That took about 95% of all the total time I spent on it
• If cssu is installed, the not supported options are now hidden instead of greyed-out
• Bugfix: theme customizer would crash if nothing was selected and you pressed load in the "Color presets" screen (now the first entry is always selected at start)
• The custom hildon-home (and related code) is removed, so it should pose no potential risk
• The option set fast-transitions is removed
• The included transitions.ini file is removed
• some references to cssutransitionstuner are removed

As mentioned I did not test it thoroughly, but if you are brave enough to try it at your own risk, you can get the updated version here: theme-customizer_0.9-80_all.deb