2012/11/16 Darrell Anderson <humanreadable@yahoo.com>
I filed enhancement request 1324 to add a mouse double-click test area (http://bugs.pearsoncomputing.net/show_bug.cgi?id=1324).

If you read the request you'll find a link to a screen shot of such a feature in GNOME:

http://www.bbc.co.uk/accessibility/guides/mouse_easier/doubleclick/linux/gnome/index.shtml

If you are familiar with GNOME perhaps you could help track the code for that dialog and provide some links here or in the bug report.

Thank you!
Gnome code won't help here:
they just apply settings immediately after changing the slider and the bulb light on ordinary double click event.

But KDE-style setting dialogs requires apply button so you should manually keep an eye on the time... anyway it still will be easy to implement for person who are familiar with trinity/Qt3 code...
IMO here is another issue: could you find some nice artwork for this? eg a couple of bulbs: lightning and not