Okay, adding a dialog box is trivial here.

1. Open up the widget with Winzip.
2. Go to tenplustwo.js
3. After this line:

if (preferences.usesound.value == 1) play("Resources/workstart.wav");

add

alert("Work Start");

on a new line.

4. Likewise, after

if (preferences.usesound.value == 1) play("Resources/breakstart.wav");

add this line:

alert("Break Start");

5. Then open the modified widget (go to the .kon file and it will open it as usual).

OK, now I'm having problems with getting it to work on a mac! Downloaded it and unzipped it to form a .widget folder. Putting this in the /library/widget folder doesn't seem to work, nor naming it as tenplustwo.wdgt. I'm a total dashboard newbie here and any help is appreciated! All the other widgets I've used are automatically installed.

nice widget! but the sliders just could not meet my need, so I modified it to use textbox instead of slider. The sound too, seems not doing the job for me, so I change it also !
for the pop-up someone suggested, I guess it is a good thing, however, I guess a better sound clip could just do the job.
On a second thought, maybe users will disable sound, so a pop-up would be good for them.

Excellent! But as someone has mentioned: "Good, but needs a popup and a way to change the sound."

Good, but needs a popup and a way to change the sound. And possibly a confirmation dialog to change states.