Adding a preference to an admin panel

You simply need to use the preference smarty plugin in one of the administration panel templates (templates/admin/include_*.tpl).

{preference name=example_my_pref_name}

How to hide options with dependencies

Just add id="feature_xyz_childcontainer" where feature_xyz is the name of the parent features. So if parent feature is off...

For a radio field use id="fgal_use_db_childcontainer_1" for the first radio button, id="fgal_use_db_childcontainer_2" for the second radio button ...

<div class="adminoptionboxchild" id="feature_multilingual_childcontainer">
This text will just appear if feature_multilingual is activated
</div>

To have a longer preference name in search results, yet a shorter one visible in the template:

{preference name=some_name label="{tr}Shorter Name{/tr}"}

Preference always visible

{preference name=feature_wiki visible="always"}

This can be useful to avoid the basic/advanced tags (filters) on certain admin panels

Templates

The templates to modify the look & feel of the preferences:
http://tikiwiki.svn.sourceforge.net/viewvc/tikiwiki/trunk/templates/prefs/