This may be an easy to make add-on ... but still I don't know how to make it ... as the title says ... it is an extension that adds a white box in your 'application settings' in which you can add your forum's tagline in it... much like a header as in blogs ... which is a single line of text that describes the purpose of your forum or just a motto ... and it will be placed just beneath the forum's name(in every page that the forum's name appears in it) ... may be you can enable html in it or not ....
To tell you the truth ... this isn't a top priority extension ... and I don't want to waste the time of anyone who can make extensions on this instead of another high priority extensions .. so .. if it happens and anyone have free time .. please consider making this add-on ...
If all you want is for it to show up under your forum title at the top of the page, you can add more text to the "Banner title" field. For instance if your forum is called "The Happy Happy Forum", and you want it to say "where everyone is happy" underneath, you can fill this in in the banner title: The Happy Happy Forum<br>where everyone is happy
And of course, you can style things a bit if you want, for instance: <span style="font-weight:bold;">The Happy Happy Forum</span><br><span style="font-size:10px;">where everyone is happy</span>
Although it comes late ... but Thanks bjrn ... this is exactly what I wanted ...
But how can I make it as I've mentioned before(an extension) ? I want to add that white box in the "Application Settings" page with the styling you wrote ... so that you can just add the text you want without worrying about styling it...